Once a 19th-century brasserie, this McDonald's exterior celebrates Alsatian design and the "King of Beer."

A plaque marks a former safe house on the secret route, now hidden next to a McDonald's.

When the town wouldn't allow the fast-food behemoth to build a new restaurant, they put one inside an 1850 home.

This unlicensed collection of fast-food memorabilia sits on the site of the first ever McDonald's restaurant.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

One of the largest pieces of scientific equipment ever carried on a NASA space shuttle sits in a Chicago alley.

This arid landscape was once a lush wetland. Today, it's a paleontological site filled with fossilized mammoths, sabertooth cats, and more.

The ruins of an 18th-century mansion that was once named "Mistake" by the man who had it built.

The ruins of a 12th-century Cistercian monastery can be found alongside World War II tank traps and pillboxes.

In 1329, Christine Carpenter entered this small stone cell in the hopes of becoming a living saint.

This eerie abandoned building with a dark history is said to be one of the most haunted places in the Philippines.

This carved stone slab marked the grave of a local dragon slayer, who makes a killer pie.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Floor-to-ceiling frescoes by local art students cover the interior of a nearly 200-year-old church.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

This sandstone building is a relic of the Overland Trail.

A lasting remnant of The Blitz.

When construction began on this hotel, developers were surprised to find the ruins of an ancient civilization.

The closed and crumbling Francoist luxury resort for workers is still full of life—for now.

The first woman in America to receive a medical degree.

A floating McDonald's built for Expo '86 is now a derelict relic on Burrard Inlet.

A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.

A registered historic landmark shrouded in unsettling local legends.