Week-long block party becomes a competition for the best decorated street.

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

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

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

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

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

This colorful statue welcomes visitors to a Barcelona park.

This former coal gasification plant found a curious second life as a popular public park.

A curious collection dedicated to human and animal anatomy and pathology.

Exploring the Netherlands’ textile past and future under one roof.

A dream-like maze full of strange art, surreal spaces, and fantasy landscapes to get lost in.

An independent cinema housed in a former pathological anatomy laboratory.

This tribute to the fictional detective stands at the famous literary character's address.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

It's just another skyscraper, but it's shaped like '90s cell phone.

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

Tourists to the mountaintop Sicilian town often overlook its ancient fortifications.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

This 19th-century fountain features sculptures of little gnomes that help with chores.

The largest 19th century panorama in the world still in-situ.

An underground city of ancient quarry tunnels hid thousands of Allied soldiers in WWI.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.