Built by a king and rebuilt by an emperor, this aqueduct transported water for 1,200 years to this ancient Mediterranean hub.

Chiseled out of a sandstone cliff, one farmer's unfinished art project lies in ruins.

While you're unlikely to find riches here these days, this remote mine is a time capsule of the Gold Rush era.

This sturdy, circular stronghold served as one of the forts that protected the Venetian Lagoon.

This glass skywalk offers vertiginous views down the volcanic cliffs to the beach below.

A melancholy guardian doubles as a judicious godmother to this small town cemetery.

This strange pyramid is a unique feature of the Austrått Manor.

The precise origins of this pink sandstone temple are unknown.

The symbolic center of Ireland, this summit also offers panoramic views of the countryside.

An islet filled with wooden houses where the open sea meets a lagoon.

A signal indicates the entrance to this alley, rumored to be a meeting place for witches.

Centuries of warfare, tragedy, executions, and poetry come together in this 13th-century fortress.

This grave marks the final resting place of pioneer John Chapman, better known as Johnny Appleseed.

Hidden in magnificent rolling countryside, see what may be the largest modern stone circle in the world at Wisconsin's very own "Stonehenge”

An ancient fortification lives on in this Chinese city.

The grotto where Saint Ignatius of Loyola lived as a hermit for nearly a year.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

A former special storage facility for documents during the Cold War.

A once-fairy tale mansion now stands in a state of disrepair.

This snack factory boasts several tributes to its popular line of rice crackers, including a quasi-shrine.

The best place to send your postcards home from Antarctica.

This 19th-century pub features stained-glass windows celebrating Victorian-era "champions."

A watering hole from the late 1800s in the heart of the Campsie Fells.

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