These four small islands contain unique hexagonal rock formations.

This unusual lava tube spouts seawater during high surf.

This volcanic island in the Pacific just keeps growing and growing.

This dramatic sea spire is home to the world's rarest insect and is part of the lost continent of Zealandia.

Plains of ash and pair of semi-active volcanoes contribute to the otherworldly beauty of this little-known Vanuatu island.

This Canary island is a quintessential example of nature’s beauty, and its unbridled fury.

The cell which saved the life of Ludger Sylbaris, "the man who lived through Doomsday."

An island in the middle of a lake, in the middle of a volcano, in the middle of a bigger lake, in the middle of a bigger island, in an archipelago, in the Pacific Ocean.