Raufarhólshellir
... that the Icelandic lava tube Raufarhólshellir was temporarily closed in 2016 to remove several tonnes of garbage left by visitors?
... that the Icelandic <a href="./Lava_tube" id="mwAgk" rel="mw:WikiLink" title="Lava tube">lava tube</a> <b id="mwAgo"><a href="./Raufarhólshellir" id="mwAgs" rel="mw:WikiLink" title="Raufarhólshellir">Raufarhólshellir</a></b> was temporarily closed in 2016 to remove several <a href="./Tonne" id="mwAgw" rel="mw:WikiLink" title="Tonne">tonnes</a> of garbage left by visitors?