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

Originally a brothel during the Klondike Gold Rush, this bar once used dolls to denote when ladies were working.

On top of a sheet metal business in Juneau stand nearly a dozen charming Wizard of Oz statues.

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

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

A small horde of mythical creatures lurk almost imperceptibly within the museum's wildlife dioramas.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

A small but immensely extravagant palace built by the "Night King."

The prototype for all Nazi concentration camps.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

The fairy tale castle of the "fairy-tale king."

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

An artsy hidden staircase leads to breathtaking views of San Francisco.

The building that inspired Shirley Jackson's "The Haunting of Hill House."

A museum dedicated to the alleged Roswell Incident.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

Natural sonic phenomenon comes with a grisly legend of murder and blood.

A sprawling collection of over 106,000 toys from around the world.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.