This stimulating sex toy museum is sure to arouse the interest of its visitors.

A once-magnificent collegiate church is falling into ruin.

This abandoned Belgian fortress is purposefully being left to nature.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

This medieval "painted village" is famous for its geometric facades.

A unique structure located on the grounds of one of five grand palaces that were built by the Joseon dynasty.

China’s breathtaking futuristic library is lined floor to ceiling with fake books.

Where the Great Wall of China meets the sea.

A spectacular annual festival centers around humans throwing molten iron against a wall at night.

Thanks to the building of a life-giving reservoir, part of the Great Wall of China is now a dive site.

Though these human-made islands were constructed as an escape for the wealthy, they rarely see many visitors.

Bali's remote "gateway to heaven" is one of the most sacred places on the island.

This Hindu temple is an architectural marvel designed and built according to ancient Indian principles.

Dating back to the fourth century, it's the oldest Hindu temple still in use in the Kathmandu Valley.

Singapore's oldest Hindu temple.

A modern mechanical planetary system, part of a 10,000 year clock.

27-room home built with the fortune of a sugar magnate.

One of few lasting examples of the brief octagon craze that developed into folly.

A brooding mansion of clinker brick stands out among the Victorian houses of Pacific Heights.

Built in 1906, this unique building was the first Hindu temple in the United States.

This serene, turquoise lake in an extraordinary nature reserve showcases a rare natural phenomenon.

Rainbow-hued in the summer and crystalline in the winter, this salty lake has inspired battles, temples, and plenty of awe.

This mysterious, medieval cathedral remains unbuilt but fiercely protected.

Two massive boulders, rocking back and forth with the ebbing of the sea.