Museum dedicated to the terror regimes of Hungary.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

A recreation of the bar from the classic 1942 movie “Casablanca.”

This dizzying span over the ancient Algerian city was once the highest suspension bridge in the world.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

This massive monument towers over the city as a constant reminder of the lives lost during Algeria's hard-won war for independence.

An extraordinary mix of Phoenician, Roman, early Christian, and Byzantine ruins beautifully set overlooking the Mediterranean.

The original resting place of Queen Cleopatra and Mark Antony's only daughter.

A set of ancient rock engravings that date back to the Neolithic period.

Winner of the Leeds Award for Architecture and the Environment.

In a small courtyard resides this large mural that draws inspiration from Leeds and its history.

This sculpture made up of 22 bulbous bronze figures reminds locals of massive Weeble Woobles.

Though this bridge was originally built in the 12th century, only one of its 10 arches dates back that far.

A collection documenting Nazi occupation of Norway, including a painting believed to be made by Hitler.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Museum devoted to the artificial language of Esperanto.

A striking 12th-century-style castle built on the edge of a cliff.

One of the largest mines in Bulgaria is now home to a vast museum more than 100 feet underground.

Cathedral carved out of salt, located a mile below the Earth's surface.

A 10 million-ton rock once worshiped by the Tahamies Indians, accessed by an astounding staircase.

The Andean town where every single building is decorated with a brightly colored frieze.

A giant Troll lurks under one of Seattle's oldest bridges.