Most-visited and most-photographed slot canyon in the American Southwest.

A single tree's 2,800 aerial roots give the appearance of a complete forest.

Historic medieval fortified city in southwest France.

The United States Capitol's former columns still stand.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

This massive redwood tree has a hole in the base big enough to drive through.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

World's largest cave was only discovered in 1991, and now offers tours to the public.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

An underwater restaurant, surrounded by a coral reef.

Unable to build support structures on glaciers, the engineers for this tramway were forced to design a unique system.

Copenhagen's celebrated theme park and gardens.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

Museum preserving torture methods from the past.

Home to drunken tower-climbing goats... seriously.

A monolithic monument in Greater London.

The headless bodies of more than 1,300 guillotined victims of the Reign of Terror are buried here in mass graves.

The Pope’s secret escape route.

Devilish landscape, once cinema home to giant alien bugs, now derelict roadside attraction.

One person's lost luggage is another person's treasure.

Auburn's iconic eagle flight goes back to a 19th century eagle that dropped dead on the field after inspiring the football team to victory.

A pilgrimage site where people ask Saint Dymphna to watch over those who are not of sound mind.

Few other hotels can rival the grandeur of the Castle in the Rockies.