When were the earliest known rooms built and what features did they have?
The earliest known rooms date back to 2200 BC and featured advanced plumbing systems with ceramic pipes delivering both cold and hot water separately. Excavations at Akrotiri on Santorini reveal rooms within Minoan structures that included bathrooms with alabaster washbasins, bathing tubs, and toilets connected to an elaborate twin plumbing system. These spaces were engineered environments designed for hygiene and comfort rather than simple shelters.