An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

This ancient tomb in the West Bank is a holy site for Jews, Muslims, and Christians alike.

This amazing ancient cave was kept secret for seven years to protect it from the public.

Traditional Bedouin crafting has become an official tourist site and successful industry for its female craftspeople.

These ruins once flourished as the capital of the Lydian kingdom, often credited with the invention of metal coinage.

Flames have been burning within this mountain for more than 2,500 years.

The best-preserved ancient theater in the world.

A local scoured more than 1,000 acres for stone to create his masterpiece.

Some believe that this ancient mural depicts technology far ahead of its time, but in reality it's nothing quite out of place.

French commune at the heart of conspiracies.

The Dead Sea Scrolls were discovered in the ruins of this ancient monastic community.

These ruins by the Dead Sea is where John the Baptist met his untimely end.

As the Dead Sea continues to deplete, massive sinkholes open along its banks.

The tallest waterfall in the Judean Desert is named for its connection to a biblical figure.

This ancient theater was once the home of fierce gladiatorial battles.

A unique underground structure dating back to the 1st century BC.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

The lost Latin words were reconstructed using the holes from the nails that once pinned them in place.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

This historic stone gate tower is now just a lonely relic in the middle of a swamp.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

The ominously named cave is home to some remarkable ancient art.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.