This pagoda was once the central feature of a Buddhist temple that no longer exists.

About as hidden as can be, this specialty coffee shop is wedged between multi-story buildings at the end of a dark, skinny alleyway in Seoul.

A moody and picturesque riverside ruin overgrown with vegetation.

Achill's most recently abandoned village dates back to to the Age of Enlightenment.

The best place for scenic views of the DMZ and North Korea.

Secret North Korean passage discovered below the world's most dangerous border.

An arts and culture complex that was once a derelict American military installation in the civilian control zone of the DMZ.

Booksellers and public artworks fill this vibrant promenade along the disused railroad tracks.

This small island declared independence from South Korea in the hopes of attracting tourists.

Collected from all around Seoul, thousands of secondhand books create this photogenic tunnel.

The world's longest bridge fountain has hundreds of nozzles that create a beautiful, illuminated spectacle.

This striking arch, one of the first architectural elements constructed in Prospect Park, was recently restored to its original glory.

An unconventional space for art and science housed in a massive old warehouse.

Walking around West Harlem reveals a scavenger hunt of beautiful bird murals.

Head past the aisles of tropical fruit and imported candy at this bodega to discover a hidden, weekends-only taco stand.

This hidden oasis features a stunning view of the Hudson River and the Palisades from a castle-like museum.

Deliciousness abounds at a Guatemalan restaurant masquerading as a pizzeria.

This slender three-story building has also had several famous residents.

A collaborative art project that transformed a neighborhood in NYC's Queens.

The last remnants of what was once one of the world's grandest hotels can now be found in a Manhattan subway station.

One of the city’s oldest watering holes was originally the home of a famous James Brown (not that one).

Crammed into several rooms of a Staten Island home, this museum is a vodka-soaked paean to the pleasures of drinking.

Take in a rare, face-to-face glimpse of Lady Liberty at this tucked away Red Hook park.

Every year model trains zip through a miniature New York City that's now 150 landmarks strong.