I have mentioned the book and podcast, 99% Invisible It introduced me to the knox box, also known as rapid entry system key access. It is a way to leave keys in a safe place in case of an emergency. I hadn't heard of it or ever noticed one. The boxes were invisible to me. Once I learned about them, I found them all over. Sorry they don't make for the best photos.
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| outside a medical building |
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| outside a nursing home |
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| on campus |
