The rocks in this arid basin leave trails of movement behind them.

The largest open-air contemporary art center in Latin America is a unique experience in the Atlantic Forest.

One of the world's few mounted blue whales, its jaws are hinged open allowing visitors to descend into a lounge.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

A bronze replica of half-consumed salt lick honors a quirky town tradition.

A massive sustainable farm designed by the mastermind behind Central Park.

This museum promotes informed contraception by documenting its often secret past.

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

The history of radiation is on safe display at the foot of a radiation science laboratory.

The centuries-old trees lining both sides of this dirt road may become Madagascar's first natural monument.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

New Zealand's epic shrine to all things puzzling.

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

The oldest public library in Ireland.

Largest cave system in Africa.

Architecturally stunning library serves as the hub of Finnish scholarly life and culture.

A subterranean house of worship carved right out of the bedrock.

The premier place to experience the Victorian imagining of the steam-powered future.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

Submerged trees jut ghost-like out of an idyllic turquoise mountain lake.

The most visited, and possibly most controversial, museum in Germany.