Ghost Hunters International (2008)

Season 1: Episode 22

For their first investigation, the team researched the Chateau Lagorce, which was once home to many wealthy noblemen throughout the 19th century and was later seized by the Germans during World War II. The owner recalls seeing a shadow move across the wall and other guests have reported hearing voices throughout the building. Next, the investigators headed to the Paris Underground, which is reportedly known for its paranormal activity. According to Christopher Spence, the Underground researcher, the area was once used as a monk's monastery known as the Capucins Quarries. It was widely reported that they would see a green mist and then hours later someone from the group would die.