The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

The historic “pink house on the hill” is an architectural gem that now serves as a center for water conservation.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

The Battle of Atlanta in 360 degrees, featuring a corpse that bears a striking resemblance to Clark Gable.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

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

The narrowest street in Paris.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

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

Along the Rhine, about a mile from the historic Munster, learn the heartrending story of two lovers torn asunder, cast into unknown layers of time and space.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

It's good luck to be mocked by this monkey.

Resting place of the Texas A&M canine mascots, who watch the game from the grave with their own miniature scoreboard.

Campus tradition says couples who walk beneath this enormous oak will stay together forever.

Decades of discarded bottle caps line this alleyway, a fixture of Texas A&M.

Official museum, hall of fame, and repository of the Texas Rangers.

Housed in a century-old building, this museum's dedicated not just to soft drinks, but to the free enterprise system.

Belly up to the bar in Cowtown, don't forget to buy some boots.

The palatial McDonald's that inspired Wesley Willis.

A military museum and library dedicated to the citizen soldier.