SC, I met a guy who would go into caves and remove crystal clusters. He also searched for fossils in areas of New Jersey, and found a huge mastodon tooth the size of a brick. Pretty amazing. I mostly have minerals/crystals but also a few fossils, a large ammonite and also a decent size seashell collection. Chances are if it's collectible, I collected it at one time or another, lol. My mom also had 'packrat' tendencies, probably from growing up during the Depression era.
Never knew about vacuum tube collecting though. My dad still has a large hi-fi from the 1950s, a Grundig from Germany, which contains numerous large vacuum tubes. One of them burned out, and then the audio world went digital, but the Grundig is still used as furniture in his bedroom. It has a whole series of internal speakers, kind of like the later Bose speaker concept.
People these day just use tiny MP3 players, but there are still audiophiles out there with the 'real' stuff. I remember those 'magna plane' speakers from back in the 1970s which stood vertically and had some type of exposed membrane which you pointed at your listening chair around 10 feet away. That was the coolest sound ever, like the music was passing right thru you.