Roman hypocaust; stacked tiles under the floor created a space to circulate hot air from the furnace. The heating system was invented in order to warm a room without the smoke from open braziers that were used in the past. They were often employed within the baths to create sauna-like rooms with gradient temperatures.

The original underfloor & wall heating system.- floor supported on pilae which allowed hot air to circulate beneath

The sauna of Jean Sibelius 1905.  Ainola, Finland.

The sauna of Jean Sibelius Ainola, Järvenpää, Finland.

Very old Finnish sauna    Erikkilän vanha sauna ja sen entinen saunoittaja.

Very old Finnish sauna - Erikkilän vanha sauna ja sen saunoittaja.

Fab prefab sauna in the Venturo prefab house, designed by Matti Suuronen.

Wayback Machine 1971: The Venturo Prefab

There is really nothing new about many of the modern prefabs that everyone is going gaga over; back in the Finnish architect Matti Suuronen designed the Venturo, a bit less extreme than his wonderful Futuro House. It appears to have been used

Woman reading while taking a bath in a Finnish Portable Sauna, 1962

Yale JOEL :: Woman reading while taking a bath in a Finnish Portable Sauna, 1962

4,000-year-old sauna found in Scotland

Archaeologists uncover Bronze Age sauna house at Links of Notland Posted on September 2015 -- The subterranean passage, with the roof slabs lifted, entering one of the underground chambers.

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