A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

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

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

Made famous by "Star Wars," these troglodyte homes face an uncertain future.

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

Morocco's Argania trees are infested with nut-hungry goats.

Originally used to sell brandy, the bull-shaped billboard became an iconic symbol of Spain.

Spain's largest bullring offers a unique glimpse at architecture and history.

The current seat of the Parliament of Andalusia was once the epicenter of the Great Plague of Seville.

A complimentary beverage is offered to the bodega's resident rodents every day.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

An eerie collection of the surviving structures from a past celebration of the future.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

A 16th-century Andalusian palace.

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

The final resting place of the great navigator, or maybe his brother.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

The fishing boats that moor in this small lagoon enter and leave through a tunnel to the sea.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.