This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

A star-shaped fortress town fort built in the geometric model of the Renaissance utopian city.

This charming, hidden guild museum holds some 700 years of crossbow history.

It's where the final scene of the beloved Tom Hanks movie was filmed.

Along a California highway is a kind of Jurassic Park made of metal.

This huge ship ran aground and has simply been left to sit there ever since.

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

A wondrous old library overlooking the nation's capital.

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

A fantastic castle rumored to be the birthplace of King Arthur.

This remote castle was built to be a wealthy businessman's palace of vice but is now simply a historic vacation cottage.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

Britain’s longest ancient monument, this great 8th century earthwork was built to mark the boundary between what would become England and Wales.

Step inside Lucy, the world's largest "elephant."

Built by prisoners of war, the largest small-scale model ever built includes eight miles of tiny streams that now sit abandoned.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

The 320-year-old tree that greeted General Lafayette and rerouted an interstate highway.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.