A mixture of strange symbols, ciphers, words and cryptograms carved in 1876 remain unsolved to this day.

This human-made pond is part of a Korean palace complex first built in the 7th century.

This former psychiatric hospital was once one of the largest in Australia.

Parts of the civil rights movement unfolded in this historic eatery, helmed by the "Queen of Creole Cuisine."

A showcase of geologic history is home to one of the largest collection of lunar meteorites on Earth.

Journey through various trails to discover a land before time along the Chazy Fossil Reef.

Believed to hold the remains of Japan's most infamous fox spirit, this stone is said to kill those who dare approach.

A former reservoir that was only recently discovered after more than 60 years of disuse.

This 30,000 square-foot museum is home to an extensive collection of art and artifacts that reflect the history of southwest Ohio.

These caves are home to a small church and were used to age cheese.

A waterway covered over after the Industrial Revolution has been unearthed and cleaned up, for the enjoyment of fish and humans alike.

Nature and art meet in this curvy creation

A geological wonder that helped fuel myths of trolls and giants.

A fire lookout atop a glacial pinnacle is reached by climbing three vertiginous flights of stairs.

The preserved remains of the former Milwaukee County Hospital for the Insane are hidden in the wooded grounds of County Park.

This historical art colony is adorned with thousands of hand-carved concrete sculptures in the Mayan Revival style.

According to legend, King Arthur killed a beast that dwelled beneath the waters of this Welsh lake.

An actual piece of the Moon, brought down to Earth by Apollo 15.

At this desert restaurant, meals are cooked in solar ovens.

This rare, carefully curated collection showcases the history of neon inside a grandiose Elks lodge.

A traveling Bronze Age sacrificial stone that was used to honor elves, fairies, and other woodland spirits.

This café is dedicated to serving coffee roasted by Native American-owned companies.

Drink and learn at this striking ode to coffee culture and history.

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.