Once the largest unsupported dome in the world, beating out the Pantheon and St Peters in Rome.

A historic Georgian building and warm springs.

Stunning wetlands ablaze with pink lotus flowers.

Modern design and unusual architecture make this mountaintop temple no ordinary Buddhist retreat.

This artificial cave looks like something out of a fairytale.

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

This Cheshire museum has cuckoo clocks, a rare pipe organ and vintage motorbikes. But mostly cuckoo clocks.

A perfectly running 230-year-old silver automaton and music box.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

Home of the unusual art of water puppetry, one of Vietnam's oldest curiosities.

An ancient stone fortress considered by many to be the eighth wonder of the world.

This elaborate temple was built around one of the Buddha's teeth.

Once thought to be the Garden of Eden it holds a holy footprint claimed to belong to Adam, Buddha and Shiva.

To gaze upon the visage of Sri Lanka's biggest Buddha, one must first pass through the Tunnel of Hell.

This peaceful, round shrine in the middle of the Sri Lankan jungle acts as a beacon of peace.

The sign at the garden gate reads: "These Plants Can Kill."

An exquisite tunnel of cascading flowers.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

This vast, water-filled underground labyrinth can only be toured by boat.

The decaying ruins of Wales' first asylum for the mentally ill.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

This massive library holds what was once the largest book collection in the world.