Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Medicinal spa created with the discharge from a geothermal energy plant.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

For this chef, an active volcano is his oven.

This small museum once served as a royal hunting pavilion for King Otto Friedrich Ludwig.

A sprawling collection of books and manuscripts about ancient Greece that would have put their famed libraries to shame.

Monasteries on rock pillars, once accessible only by frayed ropes.

An abandoned swimming pool decays on the outskirts of Berlin.

This outdoor library provides around-the-clock access to around 7,000 books.

A German town is growing a building out of trees.

Berliners converted a bombed-out, disused lot into a community-run urban farm with its own cafe and bar.

This "floating railway" is one of the world's oldest monorail systems.

Admire endangered plants in a verdant garden that looks straight out of a Monet painting.

Green labyrinth formed by a karstic maze hidden in a preserved oak forest.

A French library that makes sure its love of books is writ large... giant in fact.

This collection of French root art looks like an indoor fairy wonderland.

The personal library of the founder of modern neurology is open to visitors.

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This modernist island church incorporates the Finnish nature into its worship practices.