index.html
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Layers Control</title>
<meta name='viewport' content='width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no' />
<script src='https://api.tiles.mapbox.com/mapbox.js/v1.6.1/mapbox.js'></script>
<link href='https://api.tiles.mapbox.com/mapbox.js/v1.6.1/mapbox.css' rel='stylesheet' />
<style>
body { margin:0; padding:0; }
#map { position:absolute; top:0; bottom:0; width:100%; }
</style>
</head>
<body>
<div id='map' class='dark'></div>
<script>
var map = L.map('map').setView([38.902, -77.001], 13);
L.control.layers({
'Base Map': L.mapbox.tileLayer('examples.map-zgrqqx0w').addTo(map),
'Grey Map': L.mapbox.tileLayer('examples.map-20v6611k')
}, {
'Bike Stations': L.mapbox.tileLayer('examples.bike-locations'),
'Bike Lanes': L.mapbox.tileLayer('examples.bike-lanes')
}).addTo(map);
</script>
</body>
</html>