There's a small club/museum in Austria, that preserves old planes and they offer to fly as a passenger on their pride, a restored 1941 U.S. Navy Stearman. I got a flight as a gift and went yesterday, unbeknown to me they just had, finally after 10 years of work, got their second 1940 Stearman airworthy and certified so they decided to take it into the air as well for their first flight together. Was absolutely surreal when the second one suddenly pulled into formation next to us, probably a once-in-a-lifetime experience.

If you are in the Vienna area I would highly recommend to visit them at Austrian Aviation Museum, super nice people, their hangar also is a hall that was used to zero the guns on Bf109s