r mapdark = L.mapbox.map('map-dark', 'mapbox.dark')
  .addControl(L.mapbox.geocoderControl('mapbox.places', {
    position: 'topright'
  }))
  .addControl(L.mapbox.shareControl())
  .setView([37.9, -77], 5);

var maplight = L.mapbox.map('map-light', 'mapbox.light')
  .addControl(L.mapbox.geocoderControl('mapbox.places'))
  .addControl(L.mapbox.shareControl())
  .setView([37.9, -77], 5);

var feature = {
    type: 'Feature',
    geometry: {
        type: 'Point',
        coordinates: [-77, 37.9]
    },
    p