The House of Shadows(1996)

The House of Shadows is a Swedish series that follows Class 7A during a school trip to Gotland, where strange occurrences suggest the house they're occupying is haunted. Student Vanessa experiences inexplicable seasickness and claims her bedroom floor rocks like a ship at sea each night. When supervisor Gia discovers a passenger list from a sunken vessel named Pemba—the same name as their lodging—she realizes the number of people aboard matches exactly the count of teachers and students in the house. The discovery unravels a mystery spanning seven decades. As unsettling events escalate, the group must confront what secrets the walls of Pemba conceal and what supernatural force may be drawing them into its dark history.