This enormous censer uses a pulley system installed over 400 years ago.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A remarkable medieval structure born from a 14th-century disaster.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

Romania's triumphal arch looks out over Bucharest.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

This demon atop the Notre-Dame de Paris looks utterly bored.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

The video game-themed street art first popped up in the French city.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

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.