This hilltop fort is a dark holdover from one of Latin America's bloodiest dictatorships.

This ancient burial site was once thought to be the home of a race distinctive to Ainu folklore.

This hidden fortress has been coined the "City of Ghosts."

Hidden amid the old-world charm of Savannah is a museum dedicated to the world of oddities and criminal history.

In the middle of a barren moorland, the remnants of a lost British Space Age stand like a 20th-century Stonehenge.

This now-defunct synthetic fuel plant was once a major cog in the Nazi war machine.

This outcropping was once home to a medieval monastery destroyed during the Ottoman conquest.

Morocco’s modern capital was once a haven for Barbary pirates, who went so far as to establish a republic of their own.

This now-abandoned outcrop is an important Native American spiritual site, overtaken by European settlers and mining pollution.

An expansive book store, art gallery, and curio shop with wares ranging from tarot cards to novelty socks.

This mysterious and creepy location instills a strong sense of foreboding in all visitors.

This pre-Hispanic apartment complex also includes ancestral paintings that point to its military past.

Flip your own pancakes in this old sugar mill within a Florida state park.

In this beloved beach town, a secret seafood haven lies tucked behind a car wash.

This collection of ancient, mountaintop, underground tombs was once hidden by decades of bloodshed.

Some of New York's best tacos can be found in the back of an unassuming bodega in Queens.

Through the colossal entrance to this cave you'll find limestone tubs and an underground waterfall.

This store offers tastes of Aboriginal Australia, with some contemporary and global twists.

Peanut butter trees and miracle berries are just the beginning.

This archeological site hidden behind Teotihuacán's pyramids shelters 1600-year-old murals.

The first plantation museum in the United States to focus on the lives of enslaved people.

Possibly the world's smallest museum is home to one exhibit that sheds light on the capital city's dark criminal history.

The Gunditjmara Aboriginal people of Australia began construction on this vast aquacultural complex 6,600 years ago.

At this hillside site that was once home to a Mixtec community, you'll find ruins with a view.