Indoor plumbing is very ancient. Many ancient civilizations had it, although generally only for the rich, temples, or government buildings. The Indus Valley and ancient Egypt developed it 4,500 years ago (2500 BCE). (Greek) Minoan Crete followed around 3,700 years ago (1700 BCE).
They had indoor plumbing!
Indoor plumbing is very ancient. Many ancient civilizations had it, although generally only for the rich, temples, or government buildings. The Indus Valley and ancient Egypt developed it 4,500 years ago (2500 BCE). (Greek) Minoan Crete followed around 3,700 years ago (1700 BCE).