This architecturally eclectic fortress witnessed centuries of bloody turmoil, including the massacre of its ruling clan.

Hidden up a dusty track off the Georgian Military Road is this fascinating waterfall with mountainous views.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

A late-19th century diversion canal built by hand crosses Bryce Canyon National Park and is still in use.

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

The natural history of Utah is on full display inside this museum.

The largest wildlife crossing in Utah allows local fauna to safely traverse the six-lane Interstate 80 at Parleys Canyon.

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Underground monastery and fortress.

From pink dolphins to underwater cities, this museum explores the unseen, mythical world of the Amazon river.

With over 10,000 lights, this engineering marvel lights up the city after dark.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

An effigy of a trapped paratrooper dangles from a Normandy church to commemorate one remarkable D-Day event.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

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

Four-story concrete hotel never opened to customers.

Buy your friend a drink or staple some cash to the wall for the next guy at the Salty Dawg Saloon.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

See massive fossils that are over 200 million years old in northeastern Arizona.