Svartifoss Waterfall

Svartifoss, the "black waterfall" of Skaftafell, is a thin ribbon of water falling about 20 metres over a curtain of dark, hexagonal basalt columns that fan out like the pipes of an organ. The colonnade — lava that split into pillars as it cooled — is the real draw; the flow itself is modest. It sits an uphill walk above the Skaftafell visitor centre in Vatnajökull National Park, and its shape inspired the ceiling of Reykjavík's Hallgrímskirkja.