This colorful statue welcomes visitors to a Barcelona park.

An early 20th-century bullring converted into a modern shopping center.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

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

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

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

Turntable anonymously received orphans, alms, and groceries.

The unexpectedly beloved remnants of a controversial thermal power plant.

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

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

One of the figures in this Celtic sculpture continues to puzzle archaeologists.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

This Viking gravestone carved in a rare runic style was dug up from a London churchyard.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

A solitary lighthouse in Spain was an inspiration to the great Jules Verne.

The last of Amsterdam's original sea level markers remaining in place.

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.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

This strange moor has a song written about it, Bronze Age carvings, and an alien sighting.

A measuring mishap led to these artificial stone ladies losing their stomachs.

Buried for centuries, this hidden cellar is all that remains of London's medieval Whitefriars Monastery.

This museum inside a museum tells the story of London's timepieces.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.