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A pipe brought water in from the street - with some syphoned off into the cold plunge pool - and the rest was heated in a lead boiler destined for the hot room.

Surrounded by red columns and frescoes of athletes, a visitor could cool off in the plunge pool, which is so large 20-30 people could fit in it.

Archaeologists have discovered a sumptuous private bathhouse - potentially the largest ever found there - complete with hot, warm and cold rooms, exquisite artwork, and a huge plunge pool.

This spring, Berlin will add a Scandinavian-style sauna and cold plunge pool overlooking the ocean.

It was the fact that I was seeing the bodies of my friends and of strangers in such unfiltered glory, like I was visiting a cold plunge pool for my brain.