The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

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

Countless stories attempt to explain Poland's mysterious J-shaped trees.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

This giant boulder is pinched over a 1000-meter abyss by two mountains.

Tubing through a cave lit with glowworms is a magical underground experience.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

Staves, storm-calling, and of course, necropants.

A battle between nature and architecture in the Cambodian jungle.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

On the Oregon coast there is a natural hole that seems to be draining the sea.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

An exquisite tunnel of cascading flowers.

These rat eating Giant Malaysian Pitcher Plants may have evolved to eat shrew poop.

Half of a waterfall goes into the river while the other half seems to disappear.

The tallest residential building in Africa is an unsettling Brutalist monolith.

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

A fiery crater has been burning in the Karakum Desert since 1971.

A collection of haunted artifacts chronicles the career of the world's most famous paranormal investigators.

This everlasting lightning storm may be the world's largest generator of ozone.