A scattered trail of street art adds a pop of color to the city's stark structures.

Glasgow's memorial to the International Brigade volunteers from Great Britain who fought and died in the Spanish Civil War.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

A serene public space nestled within the remains of Glasgow’s Victorian maternity hospital

Rediscovered in 1992, this abandoned medieval village once flourished by fishing and piracy.

The bronzed skull of a beheaded traitor was affixed to the city gate in the 17th century.

You can spot this teeny tiny stained-glass window from the Bonifacius bridge.

Inside this former medieval prison is a collection of objects designed to inflict unbelievable pain and suffering on the human body and mind.

This former Masonic lodge has been transformed into part museum, part bar, all awesome.

Lombardy poplars planted to imitate the size and shape of the Cathedral of Notre-Dame de Reims.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

A large measuring stick marks the lowest point of a country that is partially under sea level.

Retirement home for giant obsolete machines.

Explore the complex ecology of this multifaceted nature preserve by riverboat.

Tallest - but not most powerful - wind turbine in the world.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

Ruins of a German Castle on top of a towering stone pillar.

A small man-controlled waterfall powers an Art Nouveau elevator and is accessed via narrow gauge, solar-powered tramway.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

The site of one of the largest prison escapes of World War II.

The oldest wind turbine in Europe, constructed by a group of friends in 1932.

People in Poland have rallied to save this unnatural desert from being reclaimed by the forest.

Relive a Polish uprising via an enormous, century-old cyclorama.

Nestled in the woods lies this land art project: a hybrid between park, maze and natural monument.