Read a bit about the MiSTer FPGA project yesterday - pretty amazing stuff. As I understand it, they're basically re-creating much of 20th century hardware using a programmable FPGA board. This isn't emulation - it's high fidelity re-creations of everything from 1970s arcade boards to the PlayStation 1 (in development).
Emulation is usually good enough for me, but I might get my hands on one eventually...
https://misterfpga.org/
More of a project description:
https://emulation.gametechwiki.com/index.php/MiSTer