Elevated freight railway turned wildly successful urban park.

This 1000 year old relic-filled cave monastery and UNESCO World Heritage Site also hosts an amazing micro-miniature museum.

Tower with a double-helix spiral, adorned with letters of the Georgian alphabet.

A literally moving statue of stacked metal giants just continually trying (and failing) to find love.

The first skyscraper to include a Ferris wheel built into the facade.

When flour explodes, it's not a pretty sight.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

The only arched bridge made of stone on the entire Mississippi River.

This old residential building was once the largest flour mill in the world.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

The last bastion of Roman presence north of the Alps looms over a German town.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Rotterdammers' dirty minds gave this Santa a dirty nickname and cursed it to a life of wandering.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

Terrifying derelict military hospital once housed a recuperating Hitler.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

Now abandoned, the world's first torpedo factory is crumbling into the sea.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

This strange statue features a bust of the famous composer plopped atop a woman's body.

The oldest funicular in Lithuania has been climbing this steep hill since 1931.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

Legend says lovers who hold hands while venturing along this stone jetty and kiss at the end will remain together forever.

A small but hugely whimsical theater where marionettes play out the "The Battle of Stalingrad."