There are multiple wells, called Tala Water Wells, next to Naderi Castle in Laft, Iran’s Qeshm Island, south of the country.
The hardworking people in the region dug them through Schist rocks which had covered the ground. Since a plaster layer lies at the bottom of the wells, water stays there healthy and cold for a long time.
The number of these wells is said to stand at 366, equal to the number of days in a leap year; each day people used the water of one well.
Source: IFP News.com