Back in the early 2000s I did not have much money and but was able to get my hands on all sorts of slightly exotic and out of date computers for free. People just gave them away. I really enjoyed running Linux on old SGI or Apple computers. Over time however the novelty wore off and I realized that even old x86 hardware was cheaper and faster. Any people running Linux on some rare old hardware care to share why?
It can be a great learning experience though.