This embalmed man is one of the best preserved mummies from the Canary Islands.

Part of the medieval watchtower is displayed in an otherwise ordinary parking garage.

The little church's beautifully frescoed ceiling has earned it the nickname “the Sistine Chapel of Madrid.”

One of the world's oldest universities houses an incredible collection of anatomical models, mummified body parts, and human bones.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

The morbid items in this small and hidden museum are not for the weak stomached.

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

Remnants of a cone-shaped Nazi bomb shelter.

Preserved portions of Athens's ancient defenses are on display in a subterranean parking garage.

This small chapel holds the mummified heart of one of the heroes of the Greek Revolution.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

A Byzantine-era church hidden in a wooded area below the Acropolis.

A Byzantine church containing the holy remnants of three saints sits atop the site of an ancient temple.

A crushed gate and giant bronze head serve as a reminder of Greece's fight for freedom.

The oldest standing Byzantine church in Athens is tucked within a monastery in the middle of an upscale shopping district.

The only surviving choragic monument is a trophy awarded in 334 BC for the winning dramatic chorus.

There are many Byzantine-era churches still standing in Athens, but this is the only one with a 2,500-year-old column rising through its roof.

This striking sculpture of Icarus honors Greece's fallen flyers.

A grotesque collection of wax limbs depicting the symptoms of venereal disease.

A sharp sculpture made of thousands of pieces of jagged glass.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.