Visit Lake Coatepeque

The world’s largest volcanic lake, with Batak villages on Samosir Island at its centre.

Sacred volcano and crater lake.

Salt pans inside an extinct volcano on Sal, where the water is so dense you float as in the Dead Sea.

Hike between villages to a crater lake.

Crater lake ringed by three volcanoes and Maya villages — Aldous Huxley called it the most beautiful lake in the world.

Otherworldly landscape of limestone chimneys.

Visit the Ngorongoro Conservation Area in Tanzania, home to the world's largest inactive volcanic caldera and diverse wildlife

Sail through a narrow gap into the flooded caldera of an active volcano, past a ruined whaling station and beaches warm enough to dig a hot bath.