An experimental, automotive replica of Stonehenge.

The courtyard of this small Marinid madrasa is a dazzling example of intricate Islamic architecture.

The oldest known university in the world is in Fez, Morocco.

The largest madrasa in Morocco once housed more than 900 students within its exquisite walls.

A rare octagonal brick beacon on an isolated island in the Baltic.

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

The future of roadside attractions is this sci-fi soda mecca that is home to a 66-foot tall neon pop bottle.

Some of the best pastries in "the Czech heritage capital of Texas" come from a gas station off I-35.

These artifacts were discovered during the construction of the airport, with some dating back to the Neolithic period.

The rubbery beast is sculpted from recycled materials.

This 23-foot-tall bear stands amid the hustle and bustle of Hamad International Airport.

The busy transport hub is home to the tallest airport slide in the world.

Watch butterflies take flight before you fly.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

The tragedy of the Japanese internment camps is remembered here by a stark "Soul Consoling Tower."

The second-largest ceremonial mound in the United States is an artificial hill that is loosely shaped like a pentagon.

The museum chronicling a treasure hunter's dream, fulfilled.

The famous boat that once ferried Bogart and Hepburn still floats in Key Largo after being abandoned for years.

A historic presidential getaway on the continental United States' southernmost island.