You will notice the Zourva lighthouse in the east of part of Hydra. It is difficult to reach on land as the area is rocky and inaccessible.
The lighthouse was built in 1883. It stands 10 meters tall and has a focal height of 36 meters. It was destroyed by the Germans during World War II and was rebuilt in 1946. Until then it was run on oil and fueled by electricity in 1986. In 1989 it was automated.