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.

This cathedral hides a sculpted dog that determines your fate and an unexploded shell from World War II.

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

Water and windows define this defensive Italian well.

Two stone columns flank the grand Venice square, but there were supposed to be three.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

This ancient altar emerges from the thick forests to reveal the mysteries of Etruscan sacrificial rituals.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

Romans built the world's tallest artificial waterfall in 271 BC.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

The location of the last witch trials of Italy, known as "The Salem of Europe."

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

Five candy-colored villages on the Italian Riviera.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

A fairy tale castle in modern Rome.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Jesus' footprints and the first catacombs in the world.