One of the few listed swimming pools in Paris, the Butte-aux-Cailles pool, built in 1922 by architect Louis Bonnier, is a true pioneer of Parisian bathing culture. Its red brick façade hints at Art Nouveau, while inside, the vaulted ceiling and large arches give it an almost ecclesiastical feel. Best of all: the water is naturally warm, drawn from artesian wells.
Renovated in the early 2010s, this gleaming pool features a 33-metre indoor pool and a 25-metre outdoor pool open year-round, with a timeless, almost otherworldly atmosphere. The outdoor area also includes a solarium and a paddling pool. Go on – dive in.