Oldest flushing toilet

5000 BC are the oldest known toilets. They were located in Scotland.

7000 years ago, in Scotland people used toilets for the first time. By the way, toilets to sit on and equipped with a drainage are known to have existed since 3000 BC in India. Other nations like the Sumerians, Egyptians and Cretans are also known to have had toilets and bathrooms.

Source: https://www.planet-wissen.de/natur/anatomie_des_menschen/verdauen/pwieklokulturheimlichoderungeniert100.html