Berlin, Germany is home to many haunted places. Sections of Wilhelmstraße for example. When the street is emptiest, then you get the feeling you're being watched - but not from the windows of the buildings. Stormwater drains and any other such paths that lead beneath the ground are very menacing.
I intend (someday) to investigate and document some of the most haunted (european theatre) ww1/ww2 sites.