A reworking of the old RP ATA. An apocalyptic event casts a cloud of darkness over the world called the Ash, but it's not the only thing that has arrived.
Deep in the center of the park, where a hill is at its highest, there is a mysterious break in the Ash. It is small and only encompasses a bus-sized patch of ground, but through layers of clouds there is a glimpse of the sky. During daytime this creates a long-missed view of daylight, and during nighttime, you can see stars. It is hell to get to, but arguably worth it.