The Roman city was the birthplace of various emperors and is home to one of the empire's most impressive architectural feats.

The ancient settlement attracts tourists from all over looking to learn about the Chinese vision of the afterlife.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

This centuries-old tree tells an unusual tale of vegetation and fertility in the desert.

This ancient fort overlooks the site of a disastrous retreat from the English Civil War.

Centuries later, the victims of Great Britain's greatest hysteria are finally being remembered.

This stop on the Camino de Santiago stands high above the underwater ruins of a medieval town.

Named for the biblical warrior, the largest castle in Israel actually dates to the Middle Ages.

This ancient Bedfordshire church was abandoned when the village's population slowly began migrating to new towns.

The ruins of a medieval castle that once belonged to one of the most powerful families in the Netherlands.

An abandoned underground bathroom is now a space for public art.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

It was an experiment to prove that glacial boulders and rocks can be used in constructions and dwelling.

More than 250 sakes are available in an izakaya hidden in the basement of a Midtown office building.

This cheese shop also houses a museum devoted to Dutch dairy.

The only thing sweeter than the potatoes is the canine proprietor of this roadside stall.

A creepy statue of a hooded ghost hauls itself up from the water in a historic Lithuanian city.

A mysterious tunnel hidden in the shadows of a colorful, historic sanctuary.

This tower pays homage to a legendary Viking fort established in Massachusetts that never really existed.

The grassy landscape is home to the world's last truly wild horses.

A palatial horse museum outside Shanghai is home to the most pampered horses in the world.

The mysterious megaliths have enchanted and intrigued visitors for thousands of years.

More stones than Stonehenge, all scattered within a windswept landscape sure to enchant 'Outlander' fans.