Dimmuborgir

The lava arches twist overhead like the ribs of a collapsed cathedral, and somewhere in the maze, water drips into darkness. Dimmuborgir near Lake Mývatn in north Iceland is a labyrinth of volcanic rock formations so strange that Icelandic folklore placed its most feared creatures here — the child-snatching Yule Lads.

Dimmuborgir — meaning 'Dark Castles' — formed roughly 2,300 years ago when a lava lake drained through its own floor, leaving behind a forest of pillars, arches, and caves created by the cooling crust. The formations reach heights of several metres, creating enclosed passageways and open chambers that feel architectural rather than geological. The centrepiece is Kirkjan (The Church), a cave with a vaulted dome that could pass for a Gothic chapel. In Icelandic Christmas tradition, the 13 Yule Lads — troll-like figures who visit children in the nights before Christmas — are said to live among these formations with their mother, the child-eating Grýla. Connected walking trails of varying lengths wind through the lava field, all starting from the visitor area beside Lake Mývatn's rich volcanic landscape of pseudocraters, fumaroles, and hot springs.