Tell us about alternative physical investments people can stack, or would like to. Let's get weird

Post title says it all. I'm looking at ways to diversify my physical assets beyond precious metals and USD. There are many reasons to horde tangible assets. Maybe you're concerned about inflationary spirals? a zombie apocalypse? a quantum AI crypto-catastrophe? Or, maybe you're like me and just want to leave a complex and irritating inheritance when you die? Some of you are stacking (or thinking about stacking) really cool stuff, and I'd love to hear about it! What's in your hypothetical dragons horde? Here are some examples to get you started: *1.**N**atural turquoise is almost completely mined out, its value will increase exponentially* *2.**Swiss francs have a quarter of the expected inflation of the USD and they make girls think I'm Jason Bourne*, *3.**Be**anie babies are making a HUGE comeback ANY DAY NOW* A tangible physical asset is anything that you can touch, and expect a future financial benefit from. In this case I'd appreciate narrowing it down to stuff you can physically move, transport, and store, so traditional real estate won't work. (but livestock would) Thank you in advance for your creative and well thought out responses!