There's a piece of New York City transportation history hidden in plain sight at a Manhattan subway stop.

Down a stairway in the East Village, you could once read a plaque describing an alternate history of a fictional version of Manhattan.

A veritable variety of odds and ends.

Visit the site of a subway powered by nothing more than air--and lots of it.

Tucked in the back of this amazing antique store is an important piece of medical history.

A legendary speakeasy bookstore returns from the brink.

A Gothic-style abode built to accommodate the church's three resident peacocks.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

This massive statue is the personification of Bavaria and the first colossal statue of the modern period composed of bronze.

This abandoned hospital is one of the most haunted places in Costa Rica.

These mysterious ancient stone spheres were created by a civilization lost to time and are now mostly lawn ornaments.

The abandoned medieval theme park was meant to be the "Disneyland of the Philippines."

An island in the middle of a lake, in the middle of a volcano, in the middle of a bigger lake, in the middle of a bigger island, in an archipelago, in the Pacific Ocean.

A secret climbing tree hides along the side of a Costa Rican road.

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

An accidentally hidden library containing the ephemeral history of New York.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

This miniature village stays behind in the Breuer Building, even as the museums around it come and go.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

Visit the monolithic tomb of America's most famous general.

One of the only single-person private gravesites in New York City.