The first car-centric shopping plaza in the U.S. brought a little bit of Spain to downtown Kansas City.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

A vast city of the dead, where the deceased outnumber the living by more than a million.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

Former hunting lodge of a duke who was an avid collector of impressionist works.

Christ's blood allegedly preserved in a Belgian town.

This unusually circular centenarian barn became a Route 66 icon.

Nature's biggest mammal swims in landlocked Oklahoma.

A house built from trash known as the poor man's Hearst Castle.

The unbelievably opulent home built for an infamous newspaperman.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

This incredible college library is a visual masterpiece of mosaic art. It also looks kind of like a giant boombox.

The famous artist couple lived and worked here, in two different houses connected by a bridge.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

The old Route 66 town straddling Texas and New Mexico died along with the Main Street of America.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Home of the International Space Hall of Fame.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.