Edna St. Vincent Millay House, NYC

Known as the narrowest house in NYC, the former home of LGBT writer Edna St. Vincent Millay is something of a landmark. She opened the Cherry Lane Theatre, a hub of avant-garde performance. Gay anthropologist Margaret Mead also lived here, as did the cartoonist William Steig.

It's just 9 feet 6 inches - blink and you'll miss it. Keep an eye out for the blue plaque. Worth a quick look if you're strolling around the West Village.