This ancient theater was once the home of fierce gladiatorial battles.

The most visited, and possibly most controversial, museum in Germany.

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

A mysterious castle built as a monument to lost love.

A bizarre house filled with an astounding array of collections.

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 grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

"World's largest scrap metal sculpture" stands in an outdoor sculpture garden in the middle of Wisconsin.

One of the largest carillons in the world, this giant instrument has 67 cast-iron bells played by a keyboard.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

Tour the luxe "glass cage" that inspired and unnerved the architecture world upon its debut.

The site of the climactic scene from the classic horror film is now a historic landmark.

A memorial for a young woman and her ghost, which are claimed to have caused countless deathly shipwrecks.

Tiny castle in the middle of the Rhine made you pay to pass.

This crumbling Death Valley mining complex was known for its use of giant, 20-mule team wagons.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

This structure among the trees was the result of divine inspiration.

The only castle in North America to ever house European sovereigns.

Georges Seurat’s pointillist masterpiece has been recreated in Ohio in topiary form.

This replica of the Greek structure is in the heart of Nashville.

The most famous location in China was home to whole dynasties worth of imperial rulers.