This medieval castle was painted pink as part of a now-abandoned children's theme park.

Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.

Six tiny houses built for working class people form the largest intentional cluster of Wright homes anywhere.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

This neighborhood of futuristic ball houses looks like an alien settlement in a science fiction film.

The eclectic seaside sanctuary caters to a rather fowl crowd.

This Taiwanese promontory is covered in otherworldly hoodoo formations.

Elaborate patterns adorn the city's disappearing traditional architecture.

This forgotten Frank Lloyd Wright house is an architectural marvel at the end of a sleepy residential street.

The ancient abodes are a testament to human ingenuity amid harsh climates.

A science fiction-inspired apartment building designed by a famous Spanish architect.

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

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

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

See massive fossils that are over 200 million years old in northeastern Arizona.

Mutant vegetables, transgenic mosquitos, and atomic rodents span the walls of this one-of-a-kind museum.

This research hub in the Amazon Rainforest is perched amid one of the world's most biologically diverse landscapes.

One of the most remote lodges in the Amazon offers rare wildlife encounters and undisturbed views of the Peruvian rainforest.

A mesmerizing reservoir nestled at the heart of a pre-Islamic Yemeni village.

In Kazakhstan, a colorful cathedral with many lives once survived the most powerful earthquake in the region.

Granny Smiths and Fujis can both be traced back to Kazakhstan, where apples still grow wild.

A brilliant turquoise lake in the mountains.

A 19th-century funicular railway shuttles visitors up this surprising sea cliff to one of the world's largest camera obscuras.

A hidden tunnel leads to an abandoned slate quarry that's now a secret swimming spot guarded by cliffs.