One of ancient Etruria's most spectacular archaeological sites with impressive necropolises and rugged landscape.

This castle resides in a valley known for immense bloodshed during the Middle Ages.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

This temple was constructed entirely by Roman soldiers.

Rebuilt remains of a temple to Roman god Mithras.

Legend has it that seven Anglo-Saxon kings were coronated on this stone, located in the appropriately-named town of Kingston.

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

Norway has built what may be the world's most beautiful public toilet.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

The oldest remaining authentic Putt-Putt course that Donald Clayton created in Ohio.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

An antique store houses the last operational diner from the defunct department store chain.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

Templar knights fleeing persecution are said to have left this sword in stone as a landmark in 1307.

One of the oldest seagoing boats in the world can be found at the Dover Museum.

Described by William Wordsworth as a "World of Wonder."

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

Climb to the top of its spiral spire for spectacular views of Copenhagen.

This tiny river island switches sovereignty every six months as part of a rare, centuries-old agreement.

In the depths of Glasgow Cathedral's crypt, one pillar stands out from all others.