Qız qalası in the old town of Baku is a tower about 30m high built as a fortress in the 12th century. It is said that its foundation part dates back to BC. Also known as "Maiden's Tower".
In 2000, it was registered as a World Heritage Site as "Walled City of Baku with the Shirvanshah's Palace and Maiden Tower".
[Related blog article]
"
Pop-up card of Maiden Tower"
(2021-01-16)