Mountain where Jesus was first tempted by the Devil.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.

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

A beautiful but toxic fountain of mercury.

This cemetery features modernist statues as strange as its name.

This semi-secret storybook hedge maze is also the oldest garden in the city.

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

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

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

A collection of objects supposedly singed by the hands of souls in purgatory.

Plaques on its facade commemorate the Tiber's most destructive deluges.

A statue representing a lost Roman profession that was vandalized for centuries.

An abandoned 17th-century baroque hunting lodge with a wonderfully strange architectural plan.

This basilica is dedicated to two saints, one of which is known more for his famous quote.

Known for centuries as the famous Roman emperor's burial place, this monument is actually something else.

This ancient Roman arch misled treasure hunters for centuries.

Hidden within this iconic mountain are a set of World War II bunkers once used by German forces.

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

These hut foundations are believed to be the residence of Romulus, founder of Rome.

A massive marble foot is tucked away in a small alley near the Pantheon.

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.

Roman politician Herodes Atticus built this nymphaeum to honor his wife, whom he may have murdered.

Rome's first modern graffito is all that is left of a peaceful protest from the 1970s.