Architectureal fantasy quarter of Rome.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

A 16th-century horror show built in a lovely Italian garden.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

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

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

A crumbling hospital from the 1850s on Roosevelt Island.

A terrific purveyor of natural history objects and curios.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This secluded ruin was once a home for exotic plants.

A no-frills cinephile haven known for showing offbeat, underseen films.

This small, hidden cove is home to abandoned boats.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

An oasis of calm amid the chaos of the boardwalk, the museum traces the heritage of this beloved beachside amusement park.

An arcade packed with a rotating collection of unique independent video games.

Ride the subways of yesteryear.

This mansion on an island off the coast of Georgia once belonged to a 108-year-old heiress.