This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

One of the world's oldest universities houses an incredible collection of anatomical models, mummified body parts, and human bones.

A completely underwater art museum sends a stark message about humans' impact on the environment.

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

Commonly acknowledged as the only public monument to the Devil himself.

An architect transformed this abandoned cement factory into his castle-like workshop.

Bacteria and algae give the salty water its bubblegum hue.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

A lush indoor jungle fills this bustling Madrid transportation hub.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

This ghost town in Belgium will lose its street art when it ceases to exist.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

Two gravestones clasp hands over the religious divide.

The tallest waterfall in the Netherlands is a lovely, stepped feature that is only 50 feet tall.

The Bloemen Route, or “Flower Route”, stretches 25 miles through prime Dutch tulip country as a result of “tulip mania,” the world’s first economic bubble.

An enormous playhouse designed to look like 21 stacked Lego bricks, with another 25 million colorful Legos inside.

Dine amidst exotic plants at this former royal greenhouse.

Macabre museum devoted to historical Viennese murders.