Known as the "Valley of the Moon," this Jordanian wadi is one of the most amazing desertscapes on Earth.

This unassuming oasis elevated just above the busy streets of Jerusalem offers one of the best views of the Old City.

An ancient tunnel in Jerusalem built to redirect water in the event of a siege is one of history’s great architectural innovations.

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

Built by a king and rebuilt by an emperor, this aqueduct transported water for 1,200 years to this ancient Mediterranean hub.

An ancient necropolis of magnificent tombs.

Berlin's old airport.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

A blooming house of worship for the masses.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

At this museum in Iceland, visitors can sample fermented Greenland shark.

This beautiful, historic church looks like something out of a simpler past.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This tiny museum's sizable collection is jammed into a former underground public toilet.

An encyclopedic collection of mammal penises.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

A museum marks and documents the site of the Titanic's launch.

A memorial to a goat culled during a foot and mouth disease outbreak guards a series of fantastical caves.

400 million years of erosion shaped these fascinating seaside caves, which made an appearance on 'Game of Thrones.'

This short bridge is the only thing connecting a tiny Irish island to the mainland.

Northern Ireland's Brobdingnagian stepping stones.

The atmospheric road was never meant to be so creepy.