These 7,000-year-old cave paintings depict life in Neolithic Spain.

A helicopter memorial commemorating what was once the only way to access this West Berlin exclave.

This national landmark is also home to a massive treehouse.

Marvel at this immense work of art that greets arrivals to the city.

This stone tower was built to protect Crete from incoming pirates.

A black sand beach where glacial fragments wash ashore and look like sparkling diamonds.

This statue celebrating early Hollywood is largely forgotten, while its twin replica at Walt Disney World has become an icon.

Over a millennium ago, this site on the shores of Lake Titicaca was home to a city of more than 10,000 people.

A major pre-Columbian archaeological site in central El Salvador.

This 86,000-square-foot artwork is the largest mural in the world to cover a dam.

Dr. Fleming's work saved the lives of many bullfighters thanks to his discovery of penicillin.

The property contains 37 preserved animal effigy mounds constructed by Native Americans between 800-1100.

More than 12,000 years ago, this park was a playground for mastodons.

A sacred collection of indigenous rock art.

An underground city beneath Krakow's postwar socialist utopia.

Fascinating military history, awe-inspiring wildlife encounters, and endless outdoor adventures draw people to this sprawling park.

This peak in Chapada Diamantina National Park offers the most stunning sunsets.

One of the best places to dig—some say on the planet—for six different types of chalcedony.

In the heart of Panaji, a monument to the pioneer of modern hypnotism.

A serene, almost spiritual place to do one's business. Who knew a public toilet could inspire and awe?

Once known for its eerie appearance, this semicircular monument is all that remains of a Tokyo industrial icon.

This redwood is a historic landmark, a town’s namesake, and the dancing sideline symbol of Stanford University.

The oldest remaining building in Tacoma was once the home of the "oldest bell tower" in America.

A well-preserved example from a 1920s network of airmail navigation arrows sits near Interstate 15 in southern Nevada.