Raufarhólshellir

Raufarhólshellir (Icelandic pronunciation: [ˈrœyːvarˌhoulsˌhɛtlɪr̥]) is the fourth-longest lava tube in Iceland. The cave's proximity to Reykjavík made it popular with visitors, who caused damage to the cave. In late 2016 the cave was closed to the public to clear accumulated garbage and install lighting and a walkway to part of the cave. The cave reopened for guided tours the following year.