A stunning mosque owes its design to an Ottoman ruler nicknamed "the Butcher."

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

Neighborhood in Jerusalem is home to the ultra-orthodox haredim.

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

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

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

This peaceful sanctuary is one of the oldest Buddhist temples in Colombo.

This ancient cave temple complex is the largest and best-preserved temple complex in Sri Lanka.

Known as the most scenic route in Sri Lanka, this train line is steeped in history and offers an unparalleled view of the country.

This sacred fig tree with a link to the Buddha is one of the oldest human-planted trees in the world.

This elaborate temple was built around one of the Buddha's teeth.

Seven beautiful 1,000-year-old rock-cut Buddhist statues.

Huge herds of Asian elephants can be seen walking, bathing, and just chilling at this Sri Lankan park.

An ancient stone fortress considered by many to be the eighth wonder of the world.

This 11th-century castle sits so low you can't see it behind the surrounding buildings.

The location of the world's first telescope demonstration.

This hotel was once home to a steamliner company and became the final rest stop for Europeans heading to the New World.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

A radio telescope for listening to the stars, based in one of the cloudiest countries in the world.

Graffiti covers the walls of a room where university students through the centuries have waited nervously to defend their theses.

Building Men of War and Indiamen from Holland's Golden Age.

The 20-mile causeway that separates the Netherlands from the sea.

This towering church is home to a world-famous organ and a treasure trove of medieval art.