Explore Secret Stories Forest Hill\'s Ghost Line Tour , a self-guided interactive walking tour to enjoy whenever you want. This audio tour is part of an Ordnance Survey series of bite-sized, tongue-in-cheek stories. Expect nutty nature, smelly smugglers, raucous royals you get the idea. Immerse yourself in wonderful, wild nature reserves, and look out across London from two of its great viewpoints. Follow a ghost line, peek into a spooky tunnel, and visit the Horniman Museum - one of South London’s great treasures. Total length: 3.59 miles; Suggested age range: 4+ Purchase this Tour (and more) in the Secret Stories App, available for free download from Android Play and Apple App store. You\'ll find more details of the tour and what it contains in the app!