One man handcrafts "the best sake made outside of Japan" in a tiny desert town on Route 66.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

Iron Age grave stones and Viking burials, a short drive from Gothenburg.

According to legend, this boat-shaped henge is built over the grave of a mythic king.

This Danish rock field is actually a sprawling ancient cemetery holding the bodies of 700 Vikings.

An intricately carved Viking church overlooks a glistening fjord.

Mounds, rune stones, and a 1,000-year-old church, left behind by Denmark's first two kings.

A stone in Wolin, Poland, marks the possible location of a legendary Viking fortress.

This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

This burial mound is said to be the final resting place of Russia's first Viking ruler, Oleg of Novogrod.

This mysterious runestone embedded in a church wall is linked to the medieval cult of Saint Erik.

An otherworldly, fossil-rich cobble beach holds Viking graves, cairns, and other remains.

The suspected burial mound of legendary Viking Björn Ironside.

A perfectly circular stronghold constructed in the 10th century is now a nucleus of Viking culture housing a museum, village, and reenactment of an epic Viking battle.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

Shop of curiosities with a dinosaur museum tucked in its basement.

The world's third-largest scale model of the planets.

One of few surviving standpipe water towers in the U.S.

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

A geological oddity formed by two rivers carving out a mass of limestone on both sides.

This historic cliffside mansion uses a natural cave for air conditioning.

The oldest bar in Missouri is hidden within a limestone brewery cellar more than 50 feet underground.