The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The curious underground history of keeping Paris clean.

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

Offal and flawless onion soup are on the menu at this restaurant that once catered to the workers of Les Halles.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

Bloodstains can still be seen in this medieval church where two medics saved lives on D-Day.

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

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

The Lone Star plaque hangs in a bombed-out bunker in Normandy to honor a Texan colonel's heroic actions on D-Day.

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

This symbol of the French Revolution still stands where it was first planted during the 18th-century.

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

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

No monkeying around, this fountain was really named after the classic sci-fi film.

The only airport with a people mover system designed by Walt Disney Imagineering.

This small park features a monumental fountain wall, providing a great photo opportunity in the middle of Houston.

Once seen as a bit of an eyesore, this sculpture has become a staple of downtown Houston.

The Grand Canyon of Texas.

World's smallest skyscraper, the product of a remarkable con.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

This little museum is packed with information about the region's past and present biodiversity.

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.