A convincing looking but fake blue plaque on a wall. Text reads: "Kilburn Chasm. NW2's ancient and mysterious attraction. Fenced off for what feels like 100 years. No one knows how deep the chasm is or how long it has been here. Unlikely to be fixed this century"

Longer distance view of the plaque with two barriers in front. The chasm itself unfortunately is mostly invisible under a pile of leaves