One of Frank Lloyd Wright's final works was this UFO church.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

Cryptid lake monster honored with its own monument.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

The world's longest known cave system.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

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

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

According to the legend, this strikingly beautiful hill has miraculous healing powers.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

Architectural monsters are devouring this palace's every door and window.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Everyday, fans from across the globe visit the statue of one of the greatest Formula One drivers in history.

It took more than 300 years to build this church, which is home to two sacred vessels believed to hold the blood of Christ.

Pilgrimage site for star-crossed lovers.