The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

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

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

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

The fairy tale castle of the "fairy-tale king."

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

Palace where the nearly un-killable Rasputin was murdered.

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

A stunning architectural yet functional feat, towering over Oslo.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

This floating sculpture of ice is a poignant reminder of nature's power.

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

Sweden's "good old days" painstakingly re-created in a model village.

It houses the remains of a 17th-century version of the Titanic.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

An underground city of salt.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

A whimsical bridge uses saxophones to pay tribute to two great men and the European Union.

Dedicated to the American general whose reply to a German demand for surrender was simply "Nuts!"

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

A famed artist's inspiring work of peace and tolerance.