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

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

The world's largest wooden structure.

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

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

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

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

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

A beautiful but toxic fountain of mercury.

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

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

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

Inside this small chapel tucked away in the forest is one of the most well-preserved Danse Macabre frescos.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

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

Gargoyle head that brings good luck.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

The Habsburgs' royal collections of art and wonders.