Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

Turntable anonymously received orphans, alms, and groceries.

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

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.

Erotic art covers the walls of the largest ancient pleasure palace.

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

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

The rose garden in Regent's Park where Pongo and Perdita met for the first time in Disney's "101 Dalmatians."

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

London's only public statue of the much-married monarch adorns the gate to St Bartholomew’s Hospital.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

The Tudor-style cottage in the middle of the square is not quite what it seems.

Cold war icon and onetime "hole" in the iron curtain.

Giant topiary dog once played a role in a terrorist bomb plot.

Fountain where visitors can earn a license to be mad.

This Torino museum honors a soldier who kept the city safe using barrels of exploding gunpowder, losing his life in the process.

Now an entertainment complex, the Lingotto building was once an avant-garde auto factory with a test track on the roof.

A fake medieval village in the middle of Turin.

When this funny little building went up in the 19th century, most people thought it would simply fall over.