50 places updated May 8, 2015
50 places including Luis Muñoz Marín International Airport, LaGuardia Airport, Harry Reid International Airport, Los Angeles International Airport
5 places updated February 12, 2013
5 places including Bunker Hill Monument, Great Sand Dunes National Park & Preserve, Adams National Historical Park, Roger Williams National Monument
0 places updated
0 places
3 places updated
3 places including Chandler Pond, MIT Museum, Hatfield Marine Science Center