Wander through a hidden city orchard, hang out with a 19th-century circus troupe, find a forgotten railway line in the sea, discover Brighton's only waterfall, visit a hidden pet cemetery, borrow books from the secret library in a fridge, unearth a long-forgotten mural, browse a museum in a back-street chip shop, watch a play in an abandoned bowling green, tap the nose of a gargoyle and make a wish, enter an Earthship, step inside a secret walled garden and play glow-in-the-dark miniature golf with dinosaurs.