One of Santorini's symbols, the Church of Panagia Theoskepasti, is located near the port of Andres, on Skaros Rock, a rocky peninsula that projects into the sea. It was fashioned by multiple volcanoes that changed the shape of the island from circular to crescent. In addition, many other islands were also formed from these volcanoes. The rock was also the site of a castle until an earthquake destroyed the building in the 19th century. The white building with a blue dome housing the church is open during the day until 4pm, free for anyone to visit.
Moreover, the village of Imerovigli has some of the best views of Santorini because of its high vantage point. Visitors can reach the church via the nearby walking trail that begins at Imerovigli and runs through the cape that connects Skaros to the village. The trail ends at the Chapel of Theoskepasti. There is also a stunning underwater caldera that is worth the wait. Once you have visited the church, make sure to see the Hidden Room. The cave sits to the right of the trail and is one of the few elements that remain from the original castle structure. Tip: Weekend morning chanting begins at 7am and is broadcasted via loudspeakers to the entire district for hours. source: www.gpsmycity.com