From Souvenir of Cork & Killarney: with 19 illustrations, complete with letterpress. Dublin and Belfast: Eason & Son Ltd., (n.d.)
Extract from the above publication:
"Sunday's Well, at the end of the Mardyk, is built on the slope of a long hill overlooking the city of Cork. The name is derived from a spring, which, at one time, was supposed to possess miraculous power."