The once highest point in China blends symbolic design with a kick of adrenaline.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Ice cream stand, snack bar, and time capsule of milk conveyance.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Dim sum, served in a grand old theater.

Museum devoted to the artificial language of Esperanto.

The topiary maze at the Habsburg hunting lodge.

The Habsburgs' royal collections of art and wonders.

Handsomely crafted representations of our round planet.

The final resting place for the remains of 143 Habsburg royalty.

This magnificent museum claims to house the cranium of a disciple and the skull of a pope.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Home to items never before seen by the public.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

A marvel of Byzantine engineering under the streets of Istanbul.

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

At 207 feet, one of the world's longest continuous escalators.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The beautiful baroque library of the Hapsburg empire.

Famously misunderstood wonder of the ancient world