This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

This glass skywalk offers vertiginous views down the volcanic cliffs to the beach below.

Portugal’s highest lighthouse has one of the most impressive focal planes in the world.

These small, triangular, colorful houses are a staple of Madeira Island.

A lush oasis full of vibrant plants and striking geometric displays.

Europe's oldest still-operational tea farm also boasts a spectacular view.

A Turkish ghost town abandoned in a population exchange with Greece.

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

This arch granting triumphal entrance into Antalya was designed to honor the emperor's visit.

Roman ruins, natural methane fires and a lovely beach.

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

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

This 17th-century structure is a beautiful testimony to traditional Persian architecture

17th century mosque for Shah Abbas' harem.

The only quarter of the Old City not dedicated to a major world religion.

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

A magical oasis in the middle of the Negev Desert.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.

A serene desert oasis speckled with ancient artifacts.

Charnel house at the foot of Mount Sinai.

The deadliest diving spot in the world is also a stunning geological marvel.

This ancient structure is widely thought to be the oldest intact pyramid in the world.