Apparently the one remaining Antonov 22 visited the UK last week, routing to and from Brize via Detling and Woodley. I didn't know it was here until afterwards but can tell you I heard something "strange" from my bedroom in Central London in the night although it was presumably well to the south. That resonance carries for miles.
The Monino museum near Moscow has examples of all three of the big Soviet long-range contra-rotators, the An-22, Tu-95 and Il-114. Interesting to look at them close up, as well as things like the Mil-12 helicopter, which looks like they took the drawings for the Chinook but accidentally mounted the two main rotors perpendicular instead of in-line, then had to dream up some support structure to hold them in place ! The Soviets must have had very different research.
Whitehatter, the Il-18 is not a contra-prop. Straightforward 4-blader.
Evening Star, Defaness in later life was a feature among ex-BOAC Argonaut crews as well apparently.