A city entirely devoted to illegal gun production.

This magnificent blue mosque in Afghanistan is surrounded by thousands of white doves.

Splashes of blue in an otherwise monotonous lunar landscape.

Once an impressive link to Afghanistan’s Buddhist past, now a sad reminder of intolerance towards other cultures.

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

As the Dead Sea continues to deplete, massive sinkholes open along its banks.

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

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

A "miracle" that seems to produce more holy fistfights than holy revelations.

Crusader ruin with views over South Lebanon.

The maze-like transportation hub contains abandoned areas, derelict stores, and a resident bat colony.

It's said this was once the home of King James V's pet lion.

This city square dates back to the Scottish Enlightenment and was home to some of Scotland's brightest minds.

A rare memorial paying homage to an altruistic woman from the 19th-century.

This site contains overlapping ancient graveyards that existed about 1,000 years apart.

This rock bore witness to the last pitched battle fought on British soil.

The sign marks one of the endpoints to mainland Britain's longest overland travel route.

The most northern place on the mainland of Great Britain.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

This Scottish burial tomb once held hundreds of ancient eagle bones.

A beautifully-carved Pictish stone encased in a protective glass structure.

Where royalty waits in the height of luxury.

A statue commemorating 'the greatest inhabitant of Amsterdam of all time.'

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.