Grove Park Inn (Asheville, North Carolina) This legendary resort’s spa takes inspiration from its stunning mountain setting, with an underground grotto of 10 mineral-based, chlorine-free pools framed by cavernous rock walls, arches and tunnels. Guests can enjoy thundering waterfalls, hot and cold plunge pools and a mineral and lap pool, complete with 6,500 fiber-optic stars embedded in the ceiling above and underwater music below.