A historic natural pool was trashed. Could filling it with rocks save it?

Debate over how to protect landmark without limiting access comes as Philadelphia parks face $12.5m funding cut

This summer, Devil's Pool - a basin where the Wissahickon and Cresheim creeks meet in Philadelphia's Wissahickon Valley park - drew thousands of daily visitors from out of state, leaving mountains of trash and fresh graffiti on rocks and trees. The attention has concerned and frustrated locals, and brought back an unpopular proposal for deterring swimmers: filling the pool with rocks.

Many residents say the real issue is not any new influx of people - but how the cash-strapped city doesn't have enough park rangers.