World's second largest particle accelerator, where nature reveals its secrets.

The secret city built by the Manhattan Project.

An isolated island home to one of the oldest English-speaking communities in the region and Maryland's state dessert.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

This ''hidden'' 19th-century bridge played a simple, yet important role during the Spanish-American War.

The ruins of the first Spanish settlement in Puerto Rico.

The bat-covered home of one of the world's most popular brands of rum is located on a tropical Art Deco campus.

This small fort played a huge role defending Puerto Rico’s capital city.

This abandoned bridge to nowhere stands secluded in the woods of a Cleveland suburb.

A registered historic landmark shrouded in unsettling local legends.

Once in disrepair, this popular Texas stop along iconic Route 66 has been restored to its past glory.

Beside some power panels, a plaque celebrates the history of an alternate world.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.