This artificial cave looks like something out of a fairytale.

A breathtakingly steep set of stairs is carved directly into the face of the sea cliffs of Bonifacio.

During the Soviet era, the medieval capital of Volga Bulgaria served as a substitute for Mecca.

Sip a cappuccino in the historic cafe that introduced them to the United States.

A controversial artwork draws attention to the dark history of Prague's "Suicide Bridge."

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

The rodent-shaped sidewalk imprint that earned worldwide media attention.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

A mocking tribute to the past and modern leadership of Prague.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

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

A charming Amazigh village carved into a mountaintop.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Iran's colorful terraces are a rare geological masterpiece.

This 11th-century temple gave rise to the word "juggernaut," as well as some mysteries that defy scientific explanation.

A superb Paleo-Christian baptismal pool is preserved among the ruins of ancient Sufetula.

Fortified homes of highland warriors that are still in use today.

A MiG-17 fighter jet sits atop this memorial to the indiscriminate bombardment of Hargeisa.

The last inhabitants of one of the U.K.'s most remote islands were evacuated in 1930.

An abandoned hotel in the highlands of Bali is shrouded in stories of ghosts, curses, and corruption.

This sweet Southern elixir comes from what may be the oldest grape vine in North America.

Although it has never been a secret ninja base, this shrine still has plenty of tricks up its sleeve.

The ruins of an ancient Zoroastrian Tower of Silence believed to be the earliest example of the traditional funerary practice.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.