Spas with reservation required in Spain

Madrid, Community of Madrid

Small Japanese-inspired onsen spa in central Madrid with a wooden hot tub, Finnish sauna and massage menu, open daily for day passes.

Barcelona, Catalonia

Rooftop day spa at Casa Bonay hotel in Eixample with dry sauna, hammam, ice bath and a Japanese ofuro, booked by small-group circuit or free use.

Seville, Andalusia

A reservation-only private spa suite with pool in Seville's Casco Antiguo, booked by the hour for couples.