https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/8719151
Trash vs Treasure: aluminum can
NPS / Emily Hassell
Some items in the park are labeled "historic" and protected by the park. When in doubt, look for a date on the can: items over 50 years old are historic and should be left where they are found. If the can is rusted, it is almost definitely historic. Other historic items you may encounter are metal pieces, broken glass, and varying other materials. Please leave these in place.
A park ranger holds up an aluminum can with faded text. Original public domain image from Flickr
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