Only museum in the world devoted to bookbinding and book arts holds a permanent collection representing five centuries.

Giant money stones of Yap.

An isolated dive site teeming with cnidarians.

Ethiopia's "smoking mountain" is in one of the hottest regions on the planet and is home to two lava lakes.

Once an impressive link to Afghanistan’s Buddhist past, now a sad reminder of intolerance towards other cultures.

The footprint of a frustrated devil in Munich's Cathedral.

A museum in the childhood house of a medical pioneer.

Huge hole looks down onto an underground beach populated with sea lions.

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

The red crab exhibits one of the most spectacular migrations on earth, despite manmade obstacles.

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

Surreal riveted sea forts once protected the Kent shores from German attack.

To the great disappointment of doomsdayers, this codex merely contains records of the Moon and Venus.

An Ethiopian "Jerusalem" featuring a church hewn out of a single rock.

Watch the newest land on the planet form before your eyes.

The first island in the world designated a light-pollution-free astronomical observation point.

The most alien-looking place on Earth.

An abandoned whaling station on an active volcano offers hot springs in Antarctica, surrounded by ruined giants of industry.

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

The ruins of an ancient island city built atop a coral reef in the South Pacific are spectacular and strange enough to have inspired H.P. Lovecraft.

Repository for more than 22 million pickled specimens.