Didn't they used to have "seven acres of buildable land in Maine" as a somewhat regular bonus prize offering? (To show how serious they were about giving it away, on one episode, Pat asked the contestant, "So, what's it going to be, the land in Maine or the log cabin [another rather esoteric prize that day]?" Needless to say, that contestant went for the $25,000...
(I don't know about WoF, but TPIR gave away an airplane (not a microlight one, but one where you needed a pilot's license - the prize included 100 hours of lessons), and the Dannis James version occasionally offered trips to San Francisco by train, where you got to keep (at least) one of the train's cars.)
-- Don