One of the most significant churches in Ioulis is the church of Kimissi Theotokou, situated in the area of Katohori. It is the town's Metropolis. "Dimotikia" as the locals call it, has beautiful icons and a remarkably carved icon stand.
The Monastery of Panagia Kastriani is situated 7 km from Otzias and it is built on a rock on the eastern coast. The monastery was named after the hill of Kastri, where it is built and it includes two churches. One dates back to the 18th century, and the other, built in honour of the Virgin Mary, is said to have been built in the early 20th century. The Monastery accommodates its visitors in specially decorated cells.
The monument of the Lion ( or "Lionda", as the locals call it ), is situated 1,5 km from the north-eastern exit of the settlement of Ioulis. It is a huge, dominating sculpture, carved on slate and dated back to the Archaic Era. The monument is mentioned in many myths concerning the island of Kea.