Also known as the Great Mosque of Damascus, this is one of the world's largest and oldest mosques.

3D war panorama in Damascus built with help from North Korea.

One of the oldest and largest castles in the world.

Mysterious lost empire of the Silk Road.

Only a handful of these gorgeous historic waterwheels remain but even those are in danger from local unrest.

Ruins of the Crusaders' headquarters.

One of the world's best-preserved Roman amphitheaters is also one of the most unusual; it's made of black volcanic rock.

The northernmost point of continental Africa—or is it?

The mouldering manses of wealthy colonials still pock the streets of a Curaçao neighborhood.

The floor of the oldest surviving synagogue in the Americas is entirely covered in sand.

Believe it or not, the now-ubiquitous California avocado originated in Guatemala.

Thermal springs underneath the seabed provide the heat and bubbles for these beachside natural hot tubs.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

A 56-foot tall statue of the god of fire looks out over Birmingham, Alabama.

The southernmost outpost of the Russian Empire in colonial America.

This Buddhist temple is home to the graves of the Japanese national legends, the 47 Ronin.

These unique toilets feature transparent glass covered in PDLC film.

The seat of the lost Ryukyu Kingdom has survived numerous fires and wars over the centuries.

This naval gun is fired every day at noon, an odd timekeeping tradition the origin of which is local legend.

The highest pedestrian bridge in Singapore looks like a series of undulating waves rising between two public parks.

This house is one of the most colorful in the country, and is the last remaining example of a historic villa.

A ring of soy sauce bottle bases decorate an important Singaporean landmark.

World's largest collection of serial killer artwork and other macabre exhibits.