Mystery

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

This remote sandstone cliff has one of the richest collections of Livonian petroglyph marks.

Over a decade ago, painted penguins mysteriously appeared around Berwick-upon-Tweed for no apparent reason.

A striking depiction of Teotihuacan's mysterious "Spider Woman."

Disturbing winged beings decorate the walls of this strange abandoned hermitage.

A strange anthropomorphic stele with a mysterious inscription that has never been deciphered.

This archaeological museum in one of Peru’s most intriguing regions exhibits ancient artifacts from the Nazca civilization.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

No one's quite sure why there's a metal megaphone bolted on two rocks in the middle of the Mojave Desert.

A staggering number of rock carvings in an abandoned quarry.

These mysterious mazes carved on the rock may be up to 4,000 years old.

A mysterious carving from 17th-century London seemingly depicts a young boy sitting on a bread basket.

A mysterious inscription may hold a clue about the "Lost Colony" of Roanoke.

Cherokee alphabet, proof of ancient North American Jews, or just a hoax?

William Blake claimed to have painted this gothic masterpiece after encountering this nightmarish being in a vision.