Hike the unusual hoodoos and rock formations that form this little-known natural wonder.

Legend says train robbers stashed their gold within the depths of this unusual cave.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

An urban laboratory.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

An homage to everyone's favorite prehistoric cartoon family.

See massive fossils that are over 200 million years old in northeastern Arizona.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

Ancient pueblos built into the base of a natural canyon wall.

This historic national park is covered in the stunning ruins of red rock pueblos.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

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

A little sculpture with a large wardrobe.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

This plaza is home to a number of works, including Montpellier‘s own Arc de Triomphe.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

The house that took a plunge into the facade of a museum.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

Cold war icon and onetime "hole" in the iron curtain.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

These free-roaming horses were once destined to disappear from the land.

Originally conceived as part of a proposed Arizona State Capitol building in the 1950s, this structure built in 2004 stands as a monument to the architect's legacy.