The Pyramid of Moudros
A stone Pyramid structure-lookout, that was used to navigate ships entering the bay of Moudros and to direct them with nautical signals. There are many similar yet smaller ones to the nearby island of Lesvos for the same purpose.
However, there are many other theories about this Pyramid presented below.
https://neoskosmos.com/en/2020/05/14/life/the-mysterious-beacon-of-lemnos-and-its-australian-connection/?fbclid=IwAR2V3FTyiqIMJee4ZU4ZnwudUKUH0mReXIWQ_ZBJzeVZGWhYruD0OJcARyo