The Nightmare Realm: A Nightmare From Overseas (London)

For more than sixteen years, The Nightmare Realm has built original worlds, unforgettable characters and award-winning Halloween experiences in Ireland. This October marks a new chapter. For the first time, The Nightmare Realm crosses the Irish Sea, bringing its unique brand of cinematic horror to London. Inside Avery Hill Mansion, A Nightmare From Overseas unfolds through two headline immersive horror attractions plus five hidden secret experiences woven throughout the Realm. Each headline experience is a fully realised horror journey, combining cinematic storytelling, live performances and unforgettable environments. Every environment, every character and every encounter has been created exclusively for this chapter. Before you enter: the experience lasts approximately 75 minutes. Expect uneven ground, darkness and loud sound effects. This is a live immersive experience with actors. Photography is prohibited inside the attraction, and alcohol is not permitted on site. The Nightmare Realm is designed as an intense horror experience and is recommended for guests aged 13 years and over. Guests under the age of 16 must be accompanied by a responsible adult aged 18 or over. Every guest experiences fear differently — parents and guardians should use their own judgement when deciding whether the event is suitable for younger attendees.