If you want to dive into microwave history then Microwave Museum is the right place. A beautiful online collection of microwave hardware is maintained by Allan G8LSD and Allan welcomes support and donations of all kinds. In the museum are presented mostly exhibits from UK but you can also find exhibits like Siemens RW3 Travelling Wave Tube or well known trx IC-202.
Enjoy your visit!
Photo: 10 GHz Wideband Transceiver made by Mike Scott G3LYP from Microwave Museum