I recently went to Cork on holiday, and one of the many great places I visited was Cork City Goal. The Goal was a stunning building originally opened in 1824 as part of a wave of new prisons which considered things like hygiene and moral improvement to be important for prisoner reform. The building has been beautifully restored, and the museum has a great self-guided tour you can do. However, the main attraction for me turned out to be nothing about incarceration and all about radio waves.
I had got nearly to the end of the self-guided tour and was heading into the gift shop (which unusually was not at the end of the tour), when I overheard one of the guides say:
‘I’m going to switch Marconi on’