This 880-acre facility is home to a massive collection of vintage motorcycles and cars, as well as a 2.38-mile race course.

This architectural triumph is the only Frank Lloyd Wright house in Alabama.

One person’s lost luggage is another person’s treasure.

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

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

These "anatomical machines" are only one of the many strange items in this Italian crypt.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

Two stone columns flank the grand Venice square, but there were supposed to be three.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

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

Ancient snack bar of the Roman Empire re-opened.

Go inside to really appreciate this 500-year-old technological masterpiece.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

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

A supersonic jet stands on a pedestal in this rural village as a monument to military aviation.

A gigantic statue of a Russian soldier watches over the ancient city of Plovdiv, a prominent reminder of the Soviet period in Bulgaria.

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

Be(w)ar(e) the moat around this historic Czech castle.

This Czech church doubles as something of a permanent fashion exhibition for a statue of the Infant Jesus.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.