Pfauen Insel
Berlin’s Pfauen Insel is a famed historical park located southwest of the city proper. While it may be marked with picturesque architecture and frequented by a multitude of wildlife, this serene spot certainly has a dark side. It is believed that the alchemist, Johann Kunckel, is known to roam the premises in the form of a black figure with glowing red eyes. Many claim that Kunckel experimented with techniques in his former laboratory located on the island of black magic during his lifetime, ultimately becoming cursed in the afterlife. Most of these sightings occur at the stroke of midnight.
theculturetrip.com/europe/germany/articles/6-most-haunted-places-in-germany/