From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Tucked away near more famous landmarks lies a statue meant to symbolize the confluence and continuing development of human culture.

On Gellért Hill, this statue depicts the tragic tale of lovers divided by the Danube.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

One of the most spectacular canyons in the world.

Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.

Walk in the footsteps of the gods and straddle two tectonic plates.

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

The city walls of Salé lead to the ruins of this seaside "bastion of tears."

Morocco’s modern capital was once a haven for Barbary pirates, who went so far as to establish a republic of their own.

Along the most northwestern point in Africa is an ancient cave surrounded by legends.

At this faithfully preserved medina off the Moroccan tourist circuit you can walk through six centuries of history in one day.

Founded as a refugee camp, now a popular tourist spot.

The other side is actually green.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

The oldest known university in the world is in Fez, Morocco.

Traditional 11th-century outdoor tannery.

This restored 17th century synagogue is one of the few remaining structures in Morocco’s ruined Jewish quarters.

This stucco building in North Africa was the first American-owned property on foreign soil.

New fungal and bacterial species call this deadly lake home.

More than 450 years ago, an Italian nun became the first woman to paint the iconic subject.

This popular park is home to a sea serpent sculpture that now overshadows the twisted history of its creation.

This tumultuous Icelandic lava field looks so alien European researchers want to use it as a stand-in for Mars.