Matera

The 18 rooms of this astonishingly unique hotel in Southern Italy (the town, Matera, is located right along the arch of the boot) are situated in ancient caves so old that they’ve actually been declared a UNESCO world heritage site. Philanthropist and anthropologist turned hotelier Daniele Kihlgren came upon them in the late 1990s and converted a small section into gorgeous, sparely decorated rooms. Modern tubs, simple white linens, and achingly romantic candles, which local staffers nestle into the nooks and crannies of the Neolithic walls, complement the cavernous, cobblestone-floored spaces. During the day, explore the other historic caves in town; the stunning monastery is decorated with hand-painted murals. Since the region is famously devoid of tourists, you’re all but guaranteed to have them to yourselves.