A mythical garden that once grew the golden apples of wisdom is said to have existed in this ancient Moroccan city.

Mosaics, storks, and brothels—this ancient city has it all.

Founded as a refugee camp, now a popular tourist spot.

The oldest olive tree in Greece has been bearing fruit for at least 2,000 years.

There might not be much left of these Irish ruins, but their linguistic legacy is still going strong.

Home to three historic ships from the age of Vikings.

Living fossils in this remote Australian bay provide a glimpse of what Earth may have looked like 3.5 billion years ago.

Hidden in the hills is a mysterious stone structure, known only to a few.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

The largest earthwork effigy in the world.

Europe’s oldest natural human mummy.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

An encyclopedic collection of mammal penises.

A marvel of Byzantine engineering under the streets of Istanbul.

A submerged archeological park still holds the wonders of a Roman Sodom.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

This Tuscan lake hides a 13th century town that is still visible when the water recedes.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

This sculpture is an instrument played by the swell of the seas.

A musical instrument played by the sea.

Cold storage for agricultural biodiversity.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.