Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

Bananas are often left for the first monkey America ever recovered alive after being launched into space.

A geological mystery on Camelback Mountain.

The remains of an ancient settlement in one of the oldest archeological sites in South America.

Nearly 40 miles and 1,000 years of limestone mines under Denmark.

A public park off the beaten path with a beautiful waterfall and 13th century Cistercian abbey.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

This encrypted monolith protected a secret of Norse mythology by hiding in a church wall for over a millennium.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

It took 275 years and four burials to finally put the Mayflower’s most famous passenger to rest.

On the Irish coast, 18 members of the Howard family are eternally resting in an Egyptian pyramid.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

A heartbreaking monument showing the last morning in the life of Jane Griffith.

In 2010, Nicolas Cage purchased two plots in this cemetery using one to construct this strange pyramid mausoleum.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

An enormous natural sandstone bridge in Kentucky.

Eclectic collection of rare and beautiful stones in a historic home.

Home of an evil witch famous within southern folklore.

The first full-scale tunnel built in America is short but scenic.

The small cave that housed Tennessee's "first citizen."

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

A modern addition to the Greenpoint skyline.