Emborio

Santorini Emborio: it takes its name from the greek word for "trade" (Emporeio), being for centuries the traditional trade centre of Santorini. It's the largest village of the island boasting wonderful windmills on the top of the hills, narrow streets painted in white, blue domed churches, a Cathedral, a medieval castle and a pagan church dating back to the 3rd century b.C.
 

source http://www.in-santorini.com/santorini-villages.html