Spending the night in a cave might not appeal to all, but it sure does to me. How incredible is this hotel in Sweden? It is one of the world's best preserved mine settings. They have one special suite, 155m below ground, that is surrounded by winding cavities and underground lakes. How romantic yet thrilling!
Fun fact: back in the day, they extracted around 400 tons of silver and 40,000 tons of lead...all by hand.
{Images by Sala Silvermine}