Visit the Ngorongoro Conservation Area in Tanzania, home to the world's largest inactive volcanic caldera and diverse wildlife
Salt pans inside an extinct volcano on Sal, where the water is so dense you float as in the Dead Sea.
Deep-blue volcanic crater lake ringed by weekend cafes and piers.
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.
UNESCO silver-mining town folded into an old volcanic caldera.
The worldโs largest volcanic lake, with Batak villages on Samosir Island at its centre.
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