A massive land art sculpture fills a green space once tarnished by a landfill.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

An enormous playhouse designed to look like 21 stacked Lego bricks, with another 25 million colorful Legos inside.

The charming storybook building now houses a small police museum.

A shrine-like museum entirely dedicated to soccer superstar Cristiano Ronaldo.

A symbol for the opposition to nuclear power around the world.

Tiny memorials honor individual victims of the Holocaust.

A modern, secular take on a traditional Virgin Mary motif.

Hans Christian Andersen for the postmodern world.

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

A public display of random paleontology.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

Six beautiful wooden giants are hidden around Copenhagen.

Swedish mice can dine at the Nuts of Life restaurant or take a date to the amousement park.

The final home of the legendary Danish sailor said to have lived to be 146 years old.

The apartment building where JFK's assassin lived after defecting to the Soviet Union.

Installed at a chaotic intersection, this gave London traffic cops a place to hang their heavy woolen coats.

A kaleidoscopic warehouse-maze of handmade neon signs.

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

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

Hamburgers are intensely proud of their tunnel beneath the river.

This dockworkers' lunch joint has been left leaning by a century of storm floods.

This modernist tower was saved by a fraternity with a 500-year-old penchant for shooting at wooden parrots.