The final resting place of the poets Shelley and Keats.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Roman-era ships unearthed...

Gods clash with machines in a power plant regenerated as a museum.

Jesus' footprints and the first catacombs in the world.

Ruins of a 10th century church tucked away deep in a botanical garden.

This abandoned racetrack looks like it is set to hold competitions in the apocalypse.

Abandoned waterpark turned counter-culture mecca.

The former 1920s mansion of a prominent Catalan developer was used as the Soviet Embassy during the Spanish Civil War, and there is still a bunker below the garden.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

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

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

A madman's personal garden filled with 1,000 sculpted heads.

Thousands of well-dressed mummies below a monastery.

Every inch of this chapel is covered in craftsmanship from across the world.

A collection of grotesques lines the walls of this Italian villa.

A fairytale-like medieval church perched atop a rocky cliff on Italy's "Coast of the Gods."

A petite white lighthouse perched on the ancient core of Stromboli Volcano.

A volcanic old faithful, Stromboli has been erupting continuously for the last 2000 years.

Where Aleister Crowley taught magick in "La Chambre Des Cauchemars," his "Chamber of Nightmares."

An abandoned building that once tightened a power line that stretched across Messina Strait.

An eccentric home in Sicily turns heads on a regular basis.