The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

This statue of the great Argentinian car driver is located near a famous curve of the Monaco Grand Prix.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A spectacular cave and a beguiling lake.

Go inside to really appreciate this 500-year-old technological masterpiece.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A Serbian church lit by chandeliers made of weapons.

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

An icon of the city, this chapel features an amazing dome ceiling and offers panoramic views.

This elaborate hole in the ground was built as a sacred site for an ancient civilization.

This cliff-face port is considered a masterpiece of mining engineering.

On the coast of Sardinia, a once-great mining village is finding new life as a coastal resort town.

Stalactites and stalagmites in a beautifully lit cave.

This beautiful spit of land was once the summer playground of the king of Spain.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

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

Mountain where Jesus was first tempted by the Devil.

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.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

A breathtaking viewing platform over the Alps.

An ancient knight and a symbol of the city's freedom.