A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

This shop specializes in oddities and Victorian-inspired wonders.

A psychedelic labyrinth on the San Francisco bay.

An artsy hidden staircase leads to breathtaking views of San Francisco.

On the top floor of an upscale department store stands a lavish restaurant housed in a replica of a luxury French dining car.

Nondescript elevator doors open to reveal a stunning, surreal world.

A crumbling hospital from the 1850s on Roosevelt Island.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

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

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

During the holidays, a vintage subway train whisks New Yorkers back in time.

The saddest little diner in New York.

The artist and New York City icon lived, worked and died in this converted carriage house owned by another iconic artist, Andy Warhol.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

This hulking behemoth is actually five interconnected towers built in the 1960s.