My senile memory may be letting me down, but was it not a Rallye that was advertised many years ago flying into a cave somewhere (in France?), landing, turning 'round and taking off again. I believe the biggest problem was a bit like the tunnel in the Monaco GP, rapid light/dark/light changes.
I also remember hearing some moons ago of a Rallye that was supposed to have landed across the runway at Enstone, but this may be hearsay.
TJ