The ornate miniature mansions were built for Istanbul's feathered residents.

Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

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

A fairy tale castle in modern Rome.

No need to strap in for a "ride" on this walkable roller coaster.

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

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

This sublime architectural marvel is a rare example of an expressionist church.

From dragonfruit to mangoes to durian this Thailand resort allows guests to stay inside all manner of giant fruit.

A unique seaside cave where Aleister Crowley faked his own death.

Houses are tucked between, on, and underneath giant boulders.

The magical, mossy forest that inspired Princess Mononoke.

Once the most densely populated place in the world, this island is now a ghost town.

Tokyo’s only Vaudeville-cuckoo clock–steampunk-Victorian curio cabinet time piece.

An interactive exhibition space dedicated to the kinetic sculptures of Swiss artist Jean Tinguely.

A Swiss amusement park entirely dedicated to the theory of ancient astronauts.

A mythically themed self-built sculpture park.

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

Large Hadron Collider and the Birthplace of World Wide Web.

These spooky and unusual stone formations create an underworldly landscape.

Caves famous for the dragon-slaying saint who lived there.