A quiet marker in memory of local men and women lost in WWI.

A desperate final message left by a POW on the run serves as a memorial for himself and the 97 that died with him.

This WWII plane died a quiet death, and is now a garden eel playground.

This Arabesque Italian castle was built with a primitive, if ingenious, air-conditioning system.

This military mausoleum captures the solemn grandeur that most memorials only aspire to.

Yugoslavia's biggest underground airport lies in ruins.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

Secret refuge and museum of the Duke of Florence.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

The remains of the dam that unleashed a 15-foot wall of water on Denver.

According to legend it was a nap taken under this tree that kicked off the California Gold Rush.

Abandoned landscape once home to "the world's largest winery."

Once the largest winery in the world, this castle-like building now sits abandoned on the San Pablo/San Francisco Bay shore.

The haunting ruins of Jack London's dream house.

A volcanic old faithful, Stromboli has been erupting continuously for the last 2000 years.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

The largest underground church in Europe.

A castle-like sea fort from the 17th century is now a museum to oyster farming.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

Version of the French Riviera destroyed by the sea.

Experience a quartz crystal sound bath inside a storied, all-wood sound-chamber.