One of the greatest maze designer’s greatest mazes.

An architectural oddity of six stories, accessed by graceful ramps.

The fantastic architectural models of a French traveler.

A tiled, multi-level garden of survival in Lyon.

Hundreds of hidden passageways weave through the old quarters of Lyon.

For hundreds of years, automatons moving to metallic music have been marking the passage of time.

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

A self-funded cemetery with a long list of inhabitants.

Come for the flowers, stay for the bats!

This historic observatory contains the world's oldest refracting lens telescope.

An ancient rock engraving shows Aboriginals used their advanced knowledge of the stars to hunt and gather.

A musical instrument played by the sea.

Roman ruins, natural methane fires and a lovely beach.

A Turkish ghost town abandoned in a population exchange with Greece.

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.

Roman ruins top white travertine terraces formed by ancient hot springs.

The USSR’s Conquest of Nature lead to the domestication of many moose—no squirrel.

The hermits of Karoulia protect their asocial lifestyles by living on the vertical face of a treacherous precipice.

Giant money stones of Yap.

An isolated dive site teeming with cnidarians.

A castle hand-built by a Spanish dreamer in the Australian tropical jungle.

White cockroaches and other cave species occupy this massive series of lava tubes.

A wonder of natural limestone formations etched by millions of years of natural interaction between rainfall and rock and air.

The world's largest drain sits below the city of Kasukabe, Japan.