Ghosts and spectres - Mysterious creatures from the afterlife. Since the dawn of time, people have believed in life after death, ancestors coming back to visit us, and unfortunate souls lingering between two worlds. But is it actually possible to come back to Earth as an ethereal spirit? Researchers from all over the world are attempting to add some tangibility to this seemingly incomprehensible notion. Are encounters between humans and supernatural creatures real, or are our senses just playing tricks on us?Even today, new stories of revenants or other ghostly apparitions continue to surface in forgotten places, from the haunted castle in Schallaburg, Austria, to the former tuberculosis sanatoriums near Germany's capital Berlin, or the abandoned Waldlust Hotel in Southern Germany.