Sam Battle, known for his (enthusiastic) series on modular synths (under the name ‘Look mum no computer’) also runs a museum. This can be visited online, but in real-life as well, in Ramsgate, Kent (UK).
The museum exhibits lots of projects, built by Sam Battle himself. Such as the 1000 oscillator synth (Mega Drone) and existing DIY projects like the Formant and Digisound synthesizer. But a lot more is to discover: you will find yourself in a giant mancave. The museum shows old marconi equipment, measuring equipment, tektronix oscilloscopes and oscillators, electronic education projects and a lot more.
All images are (c) This Museum is not obsolete/Sam Battle. Have a further look at: This museum is not obsolete.