Ancient paintings known as the "Sistine Chapel of Cave Art."

One of the world's most complex timepieces.

An aluminum skeleton brings Chinese mythology to the French shore.

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

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

A dad joke was inevitable when a member of this 19th-century chocolatier family married the president of France.

Museum in a swimming pool where the water still flows.

This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

What happens here stays here – unless it affects the whole world.

The 28-foot granite map plots the locations of 40 theaters in New York City.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

A popular European tradition makes its way to the states on one of America's most famous bridges.

Science fiction's grandfather has a fittingly marvelous tomb.

The encased skull that is widely believed to belong to St. John the Baptist.

A sublime medieval path adorns the marble floor of one of the most beautiful Gothic cathedrals in France.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

Elaborate tile work in this railway station tells the story of Portugal.

The body of at least one victim of a construction accident was left behind in the collapsed pylon, buried under tons of concrete.

Lavish royal estate punctuated with heated greenhouses.

Climb inside an iron crystal magnified 165 billion times its normal size.

Theme park featuring miniature replicas of European monuments.

A little sculpture with a large wardrobe.

Cozy basement bar sports an inventory of over 2,000 beers.