Round Tower

Round Tower - Credit: Wikimedia Commons

The Round Mardakan Fortress or the Small Mardakan Castle ( or , or ) is a historical and architectural monument located in the Mardakan settlement of the Khazar district in Baku. By the Decree of the Cabinet of Ministers of the Republic of Azerbaijan, it was included in the list of historical and cultural monuments of world importance. In 2001, together with other coastal defence facilities of the Caspian Sea, it was included in the UNESCO World Heritage Reserve List. Read more on Wikipedia

type: building
date from: 1232

Source: en.wikipedia.org