TARDIS sauna

The Doctor's TARDIS had a sauna lined with wooden panels and benches. (PROSE: Shroud of Sorrow)

The Eighth Doctor showed it to Tamsin Drew during her three-hour tour of the TARDIS. (AUDIO: Nevermore)

It also had a fully-stocked spa next to the laundry room in the Tenth Doctor's TARDIS, which had scented candles, a bathtub and a radio. (COMIC: Laundro-Room of Doom)