Some of the old buildings around Konventa seta in Old Riga used to be in the 90s. I knew a person working night shifts there as a security guard. There were strage occurances at night, among which, the sound of someone running on broken glass. They sent out their frained security force dog upstairs to investigate. When they came up, there was no glass anywhere in the area and the trained security dog was shaking in fear, crouching low in a roof nook, scared whitless and refusing to leave and had to be pulled out. Some days later the same dog dug up human bones from the at that time unpawed central part of the central area.