information_items_1741With its island location and towering square walls that were once impenetrable, it looks at first glance to be an ancient fortress or kremlin to keep out enemies. Others believe the 1,300-year-old structure in rural Siberia has more mystical properties and might have been a summer palace, monastery, or even an astronomical observatory. Whatever it is, more than a century after it was first explored, archaeologists are no further forward in discovering the secrets of Por-Bajin, who built it or why. At The Siberian Times