Around half a million years ago, these magnificent columnar basalt cliffs were formed from cooling lava.

Once a dining hall for boarding school students, this lodge was a popular haunt for nuclear physicists working on the Manhattan Project.

This ossuary is more than five centuries old and is heralded as one of the finest in Switzerland.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

Inside this metro station is a section of the city's former medieval fortification.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

This stop on the Camino de Santiago stands high above the underwater ruins of a medieval town.

A monument to the migrants who cross the dangerous waters between North Africa and a tiny Italian island.

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

The 25-million-year-old cavities have perplexed people for decades.

This cheese shop also houses a museum devoted to Dutch dairy.

The only thing sweeter than the potatoes is the canine proprietor of this roadside stall.

The old church, buried by the 1784 Mount Vesuvius eruption, is a remarkably well-preserved place where people now pray for the souls of the dead.

It's gunky, it's gross, and it's been freed from the sewer and put on display.

This Kyoto Starbucks takes coffee drinkers back in time.

Blink and you may miss this rustic pioneer cemetery.

The ruins of an abandoned church mingle with the graves at Oaxaca’s General Cemetery.

This outdoor library provides around-the-clock access to around 7,000 books.

A preserved portion of an ancient Athens barrier is displayed in a hotel basement.

These old towers extract salt from the sea.

Squeezing inside this deep, narrow canyon reveals a festival of desert colors.

In Spain, the ruins of a Roman military camp sit along a flooded section of a river.

Tour the inside of a massive lava tube formed during a 1949 volcanic eruption.