My son recently visited Scotland and found this small wireless museum in Kirkwall in the Orkney islands and took these 4 pictures. Orkney is group of islands situated north of the Scottish mainland in the North Sea. The museum is maintained by a group of wireless enthusiasts and collectors and the city of Kirkwall. The small museum space is jam-packed with wireless history. Notice that the building the museum is housed in was built in 1866. The second picture from the right below has a Marconi R valve circled in the timeline tree.

Single or double click on the pictures below for an enlarged view.

Here a few more pictures below that I was able to find online that further show the scope of museum contents.

Additional pictures and info can be had by using google and typing in Orkney Scotland Wireless Museum.