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.

Have fun at the world's first Buddhist waterslide park.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

The sign at the garden gate reads: "These Plants Can Kill."

The world's only museum devoted to the wonders of fluorescence.

One of the world's largest ice festivals dazzles visitors for over a month with radiant sculptures and carvings.

China's biggest e-waste village.

A son-and-daughter meat market, hawked by mom and dad.

Rivers of cattle blood gone, a strange Escheresque building remains, the last of its kind.

A progressive LGBTQ hub offers dancing, HIV testing, art, and more.

A chinese farmer builds robots from scrap.

A cliff-hanging restaurant.

The intriguing personal collection of a professional demon-chaser.

A golden temple atop a sacred mountain, known for its giant effigy of the revered Pu Xian.

An Escher-inspired library dedicated to the wonders of the human mind, yet closed to the public.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

A huge resale shop for the cast-offs of the film & television industry.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

New York's oldest magic store.

Check out the underground party scene at the "Burning Man of Brooklyn."

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

A hip bar decorated with walls of golden skulls.

Become a prohibition rebel.