The Church of the Seven Holy Young Men is a small chapel built into the coastal cave at the foot of the caldera, in Mouzaki Bay (Mouzaki Bay, Greek Όρμος Mουζάκι / Órmos Mouzáki), near Armeni Bay, at the height of the town of Finikia. It can only be reached by boat.
Two picturesque churches next to each other built on the slope of the caldera. They are located in the west of Oia, south of the main promenade that runs through the city (from the caldera). With characteristic blue domes, they are one of the most photogenic churches in Oia.
The Church of Saint Basil was built on the edge of the caldera, in the Perivolas district, at the entrance to Oia from Fira. The Water and Sewage Treatment Plant in Oia is located nearby.