Visit the Nature Glacier Tunnels about 20m under the Glacier of Hintertux in a height of around 3250m above sea level. Tunnel goes down about up to 100m into the ice for science reasons. But tours are offered daily. Tough guys can even take a swim in the ice lake which is located inside or take the Kajak or SUP for a short ride. Definitely a once in a lifetime experience. #mountains #glacier #photography #visitaustria