This open-air mosaic gallery honoring an English artist took hundreds of volunteers more than seven years to create.

A closed London rail station created to cart away the dead still bears the marks of attempts to make it less morbid.

A hands-off space for graffiti artists to hone and display their skills.

The anatomical-pathological collection of a man who changed surgery.

An unusual round church in London with a Templar past.

At the center of London’s oldest roundabout stands an obelisk that was erected in 1771, but spent several decades elsewhere.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Remnants of a Victorian garden feature sitting in public woodland.

This 1920s Dutch barge is now a floating bookstore.

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

This public park collects signposts and other memorabilia related to local history, Polish-German relations and human progress

This dazzling wooden church was constructed as part of an elaborate peace project after the Thirty Years' War.

The monument honors the first (and for a long time, only) African-born philosopher to teach at a German university.

The world’s oldest military museum has remained largely unchanged since the last days of the Austro-Hungarian Empire.

The tallest stone dam in Poland was opened by Kaiser Wilhelm II himself.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

The final resting place for the remains of 143 Habsburg royalty.

The topiary maze at the Habsburg hunting lodge.

A mysterious concrete hand reaches out from between the stones of Uniwersytecki bridge.

This 16th-century pole was once used in brutal public executions.

A Syrian family keeps memories of their homeland alive at this sweet shop.

A mural recalls a fictional woman who once lived at 23 Quai du Commerce, 1080 Brussels.

A memorial commemorating the man whose name became synonymous with taking a picture in the Netherlands.

This tank participated in the liberation of Dijon from Nazi occupation.