This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

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

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

A wall of chewing gum moonlights as collective art.

A museum dedicated to the history and exploration of both popular music and science fiction.

Hear the quietest sound from across the dome.

One part local history, 99 parts gruesome haunted house.

Roadside collection of 65,000 signs.

An abandoned aircraft sits submerged in a lake in the Alaska wilderness.

A fantastic castle rumored to be the birthplace of King Arthur.

Famously misunderstood wonder of the ancient world

The only road through the heart of Glacier National Park.

The final resting place of the great navigator, or maybe his brother.

A bizarre house filled with an astounding array of collections.

France's most famous cemetery, with some of its most curious tombs.

14th century Norse artifacts in Northwestern Minnesota could have proved a Viking landing before Columbus.

America's largest viking stands in a Minnesota city that believes it was visited by the ancient nords.

This taxidermic smorgasbord was co-created by an artist poached from the Museum of Natural History.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

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

North America's first frozen mummified remains of an ice age steppe bison, the 36,000 year-old mummy named "Blue Babe."

A trading post in the North Pole where children send letters.

Colorful boxes placed over the dead are left to rot and crumble.

The king of U.S. high points towers over every other peak on the continent.