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

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Erotic art covers the walls of the largest ancient pleasure palace.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Famously misunderstood wonder of the ancient world

A little sculpture with a large wardrobe.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This demon atop the Notre-Dame de Paris looks utterly bored.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

A bizarre roadside attraction and the first instance of miniature golf in the world.

The world's longest known cave system.

This erect, phallic geological spire wasn't always named so domestically.

The fifth-longest natural arch in the world, and the longest outside China.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

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

The unusual patterns in this rock formation result from two distinct modes of weathering.

A tunnel with windows, so you don't miss out on the impressive views.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

This massive store is home to an eccentric collection of vintage, retro, and peculiar goods.