This amazing medieval fortress stands atop a promontory along the famous Cinque Terre.

A collection of more than 10,000 racist objects that teaches the atrocities of social injustice and intolerance in American history.

A historic fortification critical to Anglo-Scottish conflicts now serves as a bed and breakfast.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

Accessible only by train, the beauty of Agawa Canyon Wilderness Park is worth the journey.

The ruins of this medieval castle overlook the lake of Piediluco in what was once a sacred forest.

The fragmented remains of a massive public bath connected to the city's water supply.

A perfectly preserved example of a fortified Medieval ricetto.

A secluded fortress from the days of the Crusades that offers breathtaking views.

This scenic fortress dates back at least 2,400 years to the time of Magna Graecia.

A crumbling watchtower and a lighthouse overlooks the site believed to be the Sirens' cliff in the "Odyssey."

A colossal aqueduct from the second century B.C., deeply hidden in a gorge on the outskirts of Rome.

This natural monument has an origin story steeped in legend.

A Wes Anderson-esque lighthouse that boasts magnificent coastal views.

Where a railroad loops under or over itself to rise or drop more than 70 feet in a short distance.

A mountain cave is the site of archaeological findings and Paleolithic rock art.

This mysterious chalk figure of a horse has been recreated and restored for more than a century.

A trio of keyhole-shaped burial mounds restored to their ancient glory.

This black sand beach was crafted from volcanic explosions including the historic Minoan eruption.

Constructed during the 1960s, this bridge is still the highest in Italy.

Brace yourself for the slowest, scariest, most spectacular drive, down the Drakensberg Escarpment.

Nearly four centuries after its founding, remnants of one of the oldest planned communities in North America are still visible in southern Brooklyn.

A legendary ghostly hound supposedly left dark marks on a place of worship.