2 grotto Hotels

In the Austrian village of Leogang, a family-run hotel has just pulled off something remarkable. The Krallerhof isn't content with being another five-star alpine retreat – it's gone and built what might be Europe's most architecturally audacious spa. Picture a 50-meter infinity pool suspended in a lake, with the jagged …

Stay in the famous caves of Guadix in Spain’s famous Granada province. While most of the world’s caves are ancient, agricultural workers carved these from soft stone over the last 200 years. Today you can stay in any one of these luxuriously appointed grottos. They keep a comfortable temperature all …