diff --git a/backend.js b/backend.js
index 42fa231..712b4be 100644
--- a/backend.js
+++ b/backend.js
@@ -3,6 +3,7 @@ var crypto = require('crypto');
 var mapnik = require('mapnik');
 var util = require('util');
 var sm = new (require('sphericalmercator'))();
+var queue = require('d3-queue');
 
 module.exports = Backend;
 
@@ -35,6 +36,9 @@ function Backend(opts, callback) {
         backend._fillzoom = 'fillzoom' in info && !isNaN(parseInt(info.fillzoom, 10)) ?
             parseInt(info.fillzoom, 10) :
             undefined;
+        backend._lookback = 'lookback' in info && !isNaN(parseInt(info.lookback, 10)) ?
+            parseInt(info.lookback, 10) :
+            undefined;
         backend._source = source;
         if (callback) callback(null, backend);
     }
@@ -72,6 +76,7 @@ Backend.prototype.getTile = function(z, x, y, callback) {
 
     var size = 0;
     var headers = {};
+    var lookbacks = true;
 
     // Overzooming support.
     if (bz > backend._maxzoom) {
@@ -81,6 +86,20 @@ Backend.prototype.getTile = function(z, x, y, callback) {
         headers['x-vector-backend-object'] = 'overzoom';
     }
 
+    function loadAsync(lz, lx, ly, callback) {
+        source.getTile(lz, lx, ly, function (err, body, head) {
+            if (err && err.message !== 'Tile does not exist') return callback(err);
+            return callback(null, {
+                err: err,
+                body: body,
+                head: head,
+                z: lz,
+                x: lx,
+                y: ly
+            });
+        });
+    }
+
     source.getTile(bz, bx, by, function sourceGet(err, body, head) {
         if (typeof backend._fillzoom === 'number' &&
             err && err.message === 'Tile does not exist' &&
@@ -90,6 +109,25 @@ Backend.prototype.getTile = function(z, x, y, callback) {
             by = Math.floor(y / Math.pow(2, z - bz));
             headers['x-vector-backend-object'] = 'fillzoom';
             return source.getTile(bz, bx, by, sourceGet);
+        } else if (typeof backend._lookback === 'number' &&
+            err && err.message === 'Tile does not exist' &&
+            lookbacks === true) {
+            lookbacks = false;
+            var q = new queue.queue();
+            for (var lb = 1; lb <=  Math.min(backend._lookback, z); lb++) {
+                q.defer(loadAsync, bz - lb, Math.floor(x / Math.pow(2, lb)), Math.floor(y / Math.pow(2, lb)));
+            }
+            return q.awaitAll(function(err, lookbackTiles) {
+                if (err) return callback(err);
+                lookbackTiles = lookbackTiles.filter(function(t, i) {
+                    return t === null || i === lookbackTiles.length - 1;
+                });
+                headers['x-vector-backend-object'] = 'fillzoom';
+                bz = lookbackTiles[0].z;
+                bx = lookbackTiles[0].x;
+                by = lookbackTiles[0].y;
+                sourceGet(lookbackTiles[0].err, lookbackTiles[0].body, lookbackTiles[0].head);
+            });
         }
         if (err && err.message !== 'Tile does not exist') return callback(err);
 
diff --git a/package.json b/package.json
index 1d49cf1..9d74ac0 100644
--- a/package.json
+++ b/package.json
@@ -14,6 +14,7 @@
   ],
   "dependencies": {
     "aws-sdk": "^2.2.30",
+    "d3-queue": "^2.0.3",
     "s3urls": "^1.3.0",
     "mapnik": "~3.5.13",
     "tilelive": "~5.12.0",
diff --git a/test/backend.js b/test/backend.js
index 53eaeeb..25a3b15 100644
--- a/test/backend.js
+++ b/test/backend.js
@@ -70,6 +70,7 @@ tilelive.protocols['test:'] = Testsource;
         c: new Backend({ source: new Testsource('b'), minzoom:0, maxzoom: 2, fillzoom: 1, scale: 2, legacy: true }),
         h: new Backend({ source: new Testsource('b'), minzoom:0, maxzoom: 2, fillzoom: 1, scale: 2 }),
         i: new Backend({ source: new Testsource('i'), minzoom:0, maxzoom: 1 }),
+        l: new Backend({ source: new Testsource('i'), minzoom:0, maxzoom: 4, lookback: 3}),
         invalid: new Backend({ source: new Testsource('invalid'), minzoom:0, maxzoom: 1 }),
         iv: new Backend({ source: new Testsource('i'), minzoom:0, maxzoom: 1, vector_layers: [{id:'custom_layer_name'}] }),
         gz: new Backend({ source: new Testsource('gz'), minzoom:0, maxzoom: 0 }),
@@ -90,6 +91,8 @@ tilelive.protocols['test:'] = Testsource;
         h: ['0.0.0', '1.0.0', '1.0.1', '1.1.0', '1.1.1', '2.1.1', '2.1.2', '3.2.2', '3.2.3', '3.2.4'],
         // wraps image source with vector tiles.
         i: ['0.0.0', '1.0.0', '1.0.1', '1.1.0', '1.1.1', '2.0.0', '2.0.1'],
+        // test for multiple lookback
+        l: ['0.0.0', '1.0.0', '1.0.1', '1.1.0', '1.1.1', '2.0.0'],
         // wraps image source with vector tiles, with named vector layer.
         iv: ['0.0.0'],
         // loads gzip compressed protobuf.
diff --git a/test/expected/backend-l.0.0.0.json b/test/expected/backend-l.0.0.0.json
new file mode 100644
index 0000000..b87b0f6
--- /dev/null
+++ b/test/expected/backend-l.0.0.0.json
@@ -0,0 +1,13 @@
+[
+  {
+    "version": 2,
+    "name": "_image",
+    "extent": 4096,
+    "features": [
+      {
+        "raster": 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+        "properties": {}
+      }
+    ]
+  }
+]
\ No newline at end of file
diff --git a/test/expected/backend-l.1.0.0.json b/test/expected/backend-l.1.0.0.json
new file mode 100644
index 0000000..848a73e
--- /dev/null
+++ b/test/expected/backend-l.1.0.0.json
@@ -0,0 +1,13 @@
+[
+  {
+    "version": 2,
+    "name": "_image",
+    "extent": 4096,
+    "features": [
+      {
+        "raster": 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+        "properties": {}
+      }
+    ]
+  }
+]
\ No newline at end of file
diff --git a/test/expected/backend-l.1.0.1.json b/test/expected/backend-l.1.0.1.json
new file mode 100644
index 0000000..82784f7
--- /dev/null
+++ b/test/expected/backend-l.1.0.1.json
@@ -0,0 +1,13 @@
+[
+  {
+    "version": 2,
+    "name": "_image",
+    "extent": 4096,
+    "features": [
+      {
+        "raster": 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+        "properties": {}
+      }
+    ]
+  }
+]
\ No newline at end of file
diff --git a/test/expected/backend-l.1.1.0.json b/test/expected/backend-l.1.1.0.json
new file mode 100644
index 0000000..d654f6c
--- /dev/null
+++ b/test/expected/backend-l.1.1.0.json
@@ -0,0 +1,13 @@
+[
+  {
+    "version": 2,
+    "name": "_image",
+    "extent": 4096,
+    "features": [
+      {
+        "raster": 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+        "properties": {}
+      }
+    ]
+  }
+]
\ No newline at end of file
diff --git a/test/expected/backend-l.1.1.1.json b/test/expected/backend-l.1.1.1.json
new file mode 100644
index 0000000..fc7c6d6
--- /dev/null
+++ b/test/expected/backend-l.1.1.1.json
@@ -0,0 +1,13 @@
+[
+  {
+    "version": 2,
+    "name": "_image",
+    "extent": 4096,
+    "features": [
+      {
+        "raster": 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+        "properties": {}
+      }
+    ]
+  }
+]
\ No newline at end of file
diff --git a/test/expected/backend-l.2.0.0.json b/test/expected/backend-l.2.0.0.json
new file mode 100644
index 0000000..b87b0f6
--- /dev/null
+++ b/test/expected/backend-l.2.0.0.json
@@ -0,0 +1,13 @@
+[
+  {
+    "version": 2,
+    "name": "_image",
+    "extent": 4096,
+    "features": [
+      {
+        "raster": 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",
+        "properties": {}
+      }
+    ]
+  }
+]
\ No newline at end of file
diff --git a/test/expected/l.0.0.0.png b/test/expected/l.0.0.0.png
new file mode 100644
index 0000000..f56aa31
Binary files /dev/null and b/test/expected/l.0.0.0.png differ
diff --git a/test/expected/l.1.0.0.png b/test/expected/l.1.0.0.png
new file mode 100644
index 0000000..df0e065
Binary files /dev/null and b/test/expected/l.1.0.0.png differ
diff --git a/test/expected/l.1.1.1.png b/test/expected/l.1.1.1.png
new file mode 100644
index 0000000..1f3f117
Binary files /dev/null and b/test/expected/l.1.1.1.png differ
diff --git a/test/expected/l.2.0.0.png b/test/expected/l.2.0.0.png
new file mode 100644
index 0000000..87e1414
Binary files /dev/null and b/test/expected/l.2.0.0.png differ
diff --git a/test/expected/l.2.3.3.png b/test/expected/l.2.3.3.png
new file mode 100644
index 0000000..1f2a55c
Binary files /dev/null and b/test/expected/l.2.3.3.png differ
diff --git a/test/expected/l.3.1.1.png b/test/expected/l.3.1.1.png
new file mode 100644
index 0000000..8e4b8c0
Binary files /dev/null and b/test/expected/l.3.1.1.png differ
diff --git a/test/fixtures/l.xml b/test/fixtures/l.xml
new file mode 100644
index 0000000..12ad412
--- /dev/null
+++ b/test/fixtures/l.xml
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE Map[]>
+<Map srs="+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over" maximum-extent="-20037508.34,-20037508.34,20037508.34,20037508.34">
+
+<Parameters>
+  <Parameter name="bounds">-180,-85.0511,180,85.0511</Parameter>
+  <Parameter name="center">0,0,2</Parameter>
+  <Parameter name="format">png8:m=h</Parameter>
+  <Parameter name="minzoom">0</Parameter>
+  <Parameter name="maxzoom">8</Parameter>
+  <Parameter name="scale">1</Parameter>
+  <Parameter name="source">test:///l</Parameter>
+  <Parameter name="name"><![CDATA[test-l]]></Parameter>
+</Parameters>
+
+<Style name="_image" filter-mode="first">
+  <Rule>
+    <RasterSymbolizer opacity=".7" />
+  </Rule>
+</Style>
+
+<Layer name="_image"
+  srs="+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over">
+  <StyleName>_image</StyleName>
+</Layer>
+
+</Map>
diff --git a/test/fixtures/l/0.0.0.jpg b/test/fixtures/l/0.0.0.jpg
new file mode 100644
index 0000000..8b87113
Binary files /dev/null and b/test/fixtures/l/0.0.0.jpg differ
diff --git a/test/fixtures/l/1.0.0.jpg b/test/fixtures/l/1.0.0.jpg
new file mode 100644
index 0000000..78ad885
Binary files /dev/null and b/test/fixtures/l/1.0.0.jpg differ
diff --git a/test/test.js b/test/test.js
index db976b7..907705c 100644
--- a/test/test.js
+++ b/test/test.js
@@ -17,6 +17,7 @@ var xml = {
     b: fs.readFileSync(path.resolve(__dirname + '/fixtures/b.xml'), 'utf8'),
     c: fs.readFileSync(path.resolve(__dirname + '/fixtures/c.xml'), 'utf8'),
     i: fs.readFileSync(path.resolve(__dirname + '/fixtures/i.xml'), 'utf8'),
+    l: fs.readFileSync(path.resolve(__dirname + '/fixtures/l.xml'), 'utf8'),
     space: fs.readFileSync(path.resolve(__dirname + '/fixtures/s p a c e/i.xml'), 'utf8'),
     expires: fs.readFileSync(path.resolve(__dirname + '/fixtures/expires.xml'), 'utf8'),
     invalid: fs.readFileSync(path.resolve(__dirname + '/fixtures/invalid.xml'), 'utf8')
@@ -116,6 +117,7 @@ var sources = {
     h: new Vector({ backend: new Testsource('b'), xml: xml.b, scale: 2 }),
     i: new Vector({ backend: new Testsource('i'), xml: xml.i }),
     'i@2x': new Vector({ backend: new Testsource('i'), xml: xml.i }),
+    l: new Vector({ backend: new Testsource('l'), xml: xml.l}),
     invalid: new Vector({ backend: new Testsource('invalid'), xml: xml.invalid })
 };
 var tests = {
@@ -141,6 +143,8 @@ var tests = {
     i: ['0.0.0', '1.0.0'],
     // Image sources.
     'i@2x': ['0.0.0', '1.0.0'],
+    // Image sources for multiple lookback
+    l: ['0.0.0', '1.0.0', '1.1.1', '2.0.0', '2.3.3', '3.1.1'],
     // Invalid tiles that are empty
     invalid: ['1.1.0', '1.1.1'],
 
diff --git a/test/testsource.js b/test/testsource.js
index 1aca11e..119d81f 100644
--- a/test/testsource.js
+++ b/test/testsource.js
@@ -47,6 +47,12 @@ var infos = {
         maxzoom:1,
         vector_layers: []
     },
+    l: {
+        minzoom:0,
+        maxzoom:4,
+        lookback:3,
+        vector_layers: []
+    },
     'invalid-novector': {
         minzoom:0,
         maxzoom:1
@@ -120,6 +126,11 @@ Testsource.tiles = {
         memo[key] = fs.readFileSync(path.resolve(path.join(__dirname, 'fixtures', 'i', basename)));
         return memo;
     }, {}),
+    l: fs.readdirSync(path.resolve(path.join(__dirname, 'fixtures','l'))).reduce(function(memo, basename) {
+        var key = basename.split('.').slice(0,3).join('.');
+        memo[key] = fs.readFileSync(path.resolve(path.join(__dirname, 'fixtures', 'l', basename)));
+        return memo;
+    }, {}),
     gz: fs.readdirSync(path.resolve(path.join(__dirname, 'fixtures','gz'))).reduce(function(memo, basename) {
         var key = basename.split('.').slice(0,3).join('.');
         memo[key] = fs.readFileSync(path.resolve(path.join(__dirname, 'fixtures', 'gz', basename)));
@@ -149,6 +160,7 @@ function Testsource(uri, callback) {
         minzoom: infos[uri].minzoom,
         maxzoom: infos[uri].maxzoom,
         fillzoom: infos[uri].fillzoom,
+        lookback: infos[uri].lookback,
         vector_layers: infos[uri].vector_layers
     };
     this.stats = {};