This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

There has been an astronomical clock on this spot since the 14th century.

A whimsical bridge adorned with decorative dragons.

A restaurant and observation deck built in a unique broadcasting antenna.

Pilgrimage site for star-crossed lovers.

An abandoned shopping gallery built during Fascist Italy tucked in the center of Palermo.

Venice's island of the dead.

Turtles swim in a pond surrounding a classical temple in this lush park in Vicenza.

One of the tallest bell towers in Italy plays a particular melody at just two times each day.

This natural hill rose another 130 feet from the debris and rubble added after World War II.

This church is known as "The Home Church of George Washington and George Mason."

This field of concrete was once an active defense site armed with nuclear warheads.

A weathered, American Foursquare-style house originally built for lumber merchant William Wimsatt.

Standing for over 200 years, the abandoned home of a Revolutionary War hero and later a succession of prison superintendents.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

The U.S. Navy's last diesel-electric submarine rests half-submerged in the middle of Portland.