This is the cenotaph of the Cossacks found in Lemnos, when after the October Revolution they were forced to leave Russia.
They arrived around 1920 by British and French ships of the Entente and about 5,000 Cossacks landed on Limnos and camped in Moudros and Portiano.
The hunger and infectious diseases decimated the Cossacks and the rest of their fellows built in their honor a Cenotaph (or else kolouro, as they call it). In building the “Pyramid” all the Cossacks in exile in Lemnos, even the elderly and young children, were involved. At the top of the pyramid a white marble cross was placed. Unfortunately over the years the pyramid had fallen apart. Today it is almost fully restored.