A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

An icy lake tucked among jaw-dropping alpine panoramas.

Unable to build support structures on glaciers, the engineers for this tramway were forced to design a unique system.

This automated sculpture of two men peeing will spell out text messages with their micturition.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

Macabre astrological automaton clock dating to the late 1400s.

Walk or bike along a narrow strip of Belgium sandwiched by German territory.

Baroque celebration of the end of the Great Plague of Vienna.

An Austrian house of bones filled with hundreds of intricately painted skulls.

Dedicated to this region's early settlements and rich history of salt mining.

The world's oldest known salt mine.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

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

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

This historic Victorian hotel has a scandalous history of affairs and murder.

Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

The air force base preserves its scars from the Japanese attack on Pearl Harbor.

A glass display case holds the document that ended the Second World War—which one person signed on the wrong line.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

An ode to one of the first concerts broadcast via satellite.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.