An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

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

Turntable anonymously received orphans, alms, and groceries.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

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

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

Walk into an underground archeological dig, the site of the Roman Forum that was once the center of Valencia.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

An abandoned socialist utopia built in the late 19th century.

Possibly the oldest masonry dam in all of Europe.

Locals use these rock pools and waterfalls for swimming and cliff diving.

At more than 5,000 years old, these structures are among the oldest free-standing stone buildings in the world.

Ancient mysterious ruts carved in the bedrock.

The remains of a 1st-century aristocratic Roman town house featuring beautiful well-preserved mosaics.

This almost-forgotten underground dungeon housed several convicts over the years, including Caravaggio.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

These lesser-known Maltese catacombs date back over 1,700 years.

This church is named for one of the most dramatic tales in the early Christian church.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

The secret medieval communication system will whisk your words above the noise of the crowd.

This camera store in Milan holds one of Europe’s largest collections of luxury-antique cameras.

This giant middle finger statue sends an unambiguous message to Italy's bankers.