Exombourgo or Xompourgo is in the south part of Tinos island.

It is also known as Kastro and it is upon a rock with a height of 640 meters. It seems that this point was considered to be very safe, so since ancient times people chose to live there protected.
When in 1207 Tinos was occupied by the Venetians, the Gkizi brothers took advantage of the fortified position and built the castle of Saint Helena, a fortress which took its name from the church that was already there. It is no surprise that gradually a small town developed around the fortress.

The Venetians realizing the strategic importance both of Tinos and the specific point, sought and managed to build an almost impenetrable fortress that withstood several pirate and other attacks. The castle lasted until 1715 when Tinos became part of the Ottoman Empire. The Turkish conquerors destroyed the castle almost entirely.

Today you can visit the Exovourgo and see for yourself the ruins of the castle and the walls or just enjoy the breathtaking views of the area.