Once described as the "Eagle's Nest," this ruined ancient city rests on a remote mountaintop.

Naturally protected city carved from a rock face.

Live a night as a Byzantine King, with a minibar and private jacuzzi.

Hidden just under the waters around this Turkish island are the ruins of a once great city.

This famous city eluded concrete detection until the early 2000's.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.

A marvel of Byzantine engineering under the streets of Istanbul.

This little medieval church hidden in the center of Yerevan was lost and rediscovered—twice.

The world's longest nonstop reversible cable car soars through spectacular scenery to the medieval Tatev Monastery.

Centuries before the modern seismograph, Armenian monks measured quakes with this tilting pillar.

Amid the rubble of Aleppo's Old Quarter, part of a historic market has been restored and re-opened.

Mysterious lost empire of the Silk Road.

A nearly abandoned Jewish settlement perched atop a hill in the heart of Yemen.

An experimental forest at the foreground of arboreal science is also the canary in the coal mine for climate change.

The world's northernmost flowers cling tenuously to life on desolate Kaffeklubben Island.

This road winds through the steep coastal cliffside offering spectacular views for those who brave the drive.

This beautiful waterfall is not easy to reach, but offers a stunning view of the pristine green valley.

Brace yourself for the slowest, scariest, most spectacular drive, down the Drakensberg Escarpment.

Caves that can't seem to quit producing the remains of prehistoric humans.

This 7th-century monastery was sacked by Saladin.

A hyper-remote desert cave dramatized in "The English Patient."

The city-sized home palace of one of ancient Egypt's most powerful rulers gives us a rare look into the lives of the epoch's rulers.

It might not be the prettiest pyramid in Egypt, but it may be the muddiest.