Hundreds of drawings left by the land's previous inhabitants remain mysterious.

This cave was hidden for thousands of years, storing the worldly goods of ancient Native Americans.

The depictions of slaughter are surprisingly detailed at this mysterious ancient site.

This elaborate hole in the ground was built as a sacred site for an ancient civilization.

Stonehenge has nothing on Castlerigg’s views.

The hidden lair of an alchemist rediscovered in a 2002 flood.

The remains of a enormous earthen figure of unknown origins cuts across a rural Wisconsin road.

The mortal remains of a Russian prince, priest and paranormal investigator who came to America in 1792.

Legends of time travel and magical woodland creatures bolster the natural charm of this verdant sanctuary in the midst of Moscow.

Ancient rock-hewn town that witnessed key events of Georgian history.

Enter the world under the hill at this ancient UK burial chamber.

The world's most delightful not-NOT-religion welcomes visitors to the town of Templin, just like its more stoic peers.

This geothermal hot spring hides beneath a slowly growing mineral dome.

Crawling into this primordial cave may feel disconcertingly familiar.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

This protected reserve is home to a rare and beautiful species of flower.

This Route 66 classic sports a giant fiberglass rabbit that you can ride.

What remains of the summer palace of King Kamehameha III.

This state park was once an important Native American cermonial center.

This historic national park is covered in the stunning ruins of red rock pueblos.

Blackfoot petroglyphs of southern Alberta which date back as far as 7000 B.C.

Site full of incredible prehistoric paintings and archeological findings.

A preserve with 75,000 ancient drawings remains the realm of public – not just scientific – exploration.

This bone-filled cave got its name after they found 140 bear skeletons inside.