Many may have first heard of Ischia through Elena Ferrante's Neapolitan novels, but Italians have long adored this verdant volcanic island in the Gulf of Naples for its spectacular sea views and the healing powers of its thermal springs.

Ischia's mineral-charged thermal waters – terme – were discovered 3,000 years ago by the Ancient Greeks. The bubbling fonts quickly became famous for their restorative properties, said to heal infertility, rheumatism and all manners of skin conditions. A thriving island spa culture emerged, thanks in no small part to Ischia's year-round mild climate and lush hiking trails.