Giant topiary dog once played a role in a terrorist bomb plot.

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

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

The oldest Roman lighthouse still in use.

Rare karst landscape eroded from a flat seabed.

This quaint Spanish village agreed to be painted blue as a marketing stunt but found that they preferred it that way.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

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

This Navarrese cave's history of witchcraft and pagan ritual is not just embraced, but recreated each year.

A landscape decorated with enormous skull sculptures.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

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

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

The eclectic observatory castle of a 19th-century astronomer and explorer.

A copy of the Statue of Liberty greets visitors to the birthplace of Auguste Bartholdi.

Small French town or alien garage?

The world's largest solar furnace uses 10,000 mirrors to concentrate the sun's rays to generate power.

The largest crypt ever constructed in France was built in the 11th century on an ancient Druid sacred site.

Beneath the city of Lourdes, France is a massive, concrete church.

Site of one of World War I's most horrific scenes.

This French "sea of rocks" is packed with stunning rock formations and its own medieval castle.

100-windowed castle turned art gallery, built by one dedicated mason.