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 most elaborate of 12 medieval arched doorways to the old city of Burgos.

This enormous censer uses a pulley system installed over 400 years ago.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

The oldest Roman lighthouse still in use.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Cliffside houses provide a spectacular view from their perch above the valley.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

An ancient Egyptian temple in the middle of Madrid, Spain.

Mountain where Jesus was first tempted by the Devil.

This cemetery features modernist statues as strange as its name.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

These pillars at the main entrance of this church are actually a hidden musical instrument.

These hut foundations are believed to be the residence of Romulus, founder of Rome.