The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

Hamburg's first legal sex work is relegated to a gated street that still does not allow pedestrian women.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

This emotive sculpture was originally created for the 1878 World's Fair.

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

Dedicated to the art of hunting, with juxtapositions of contemporary art.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This intricately carved and hilariously huge bed was such a famous symbol both Shakespeare and Byron used it in their writing.

This one has sailed five times as far as Sir Francis Drake's famous ship.

Charles Babbage's proto-computer, painstakingly brought to life.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

Eighty million natural history specimens call this gargantuan museum home.

This beautiful site is where the first transatlantic telegraph was sent from.

This Neolithic passage tomb forms part of a World Heritage Site.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

These imposing walls and towers look more like the ruins of a fortress than a monastery.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

This striking monument pays tribute to those who died working the coal pits from the town of Cambuslang.

A sculpture commemorating the "world's best mouser" in what is likely Scotland's longest-running distillery

A remarkable feat of Victorian engineering across the Firth of Forth.