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.

World's first "penitentiary," meant to be humane, drove men insane.

It's believed that the dead were once taken out of houses through these now walled-up doors.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

In the early 1800s, surgery was also a show.

The abandoned coal loading dock is a canvas for unsanctioned art.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

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

The remains of Canada's earliest Chinese pioneers are interred along this picturesque point.

This stately Victorian-era burial ground overlooking the Pacific Ocean is home to the graves of some of British Columbia's most famous figures.

The narrowest street in Canada was once a spot for dastardly doings, now a historic piece of Chinatown.

A famous hotel houses an impression collection of mini dioramas and giant doll houses.

The ruins of this Alaska gold mine form a gorgeous ghost town.

One woman's dream became a train hotel in her backyard.

While not recognized by Guinness, this chocolate waterfall is likely to be the world's largest.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

The ghostly remains of what was once the world's richest copper mine.

This whimsical stacked cabin looks like something out of a children's book.

Gorgeous cave resemble a winter wonderland.

This frozen tunnel in central Alaska is both an engineering feat and a valuable climate classroom.