D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

A haunting tribute to pioneering photographer Clover Adams.

A nostalgic bibliographic gem.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

The oldest surviving synagogue in New York City is now a soaring art space.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

A DIY art gallery/music venue/lecture hall dedicated to video game culture.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.