That Mach loop looks fun. If I lived near there, I would visit. In fact, I'd go camping there.
I recall visiting a castle in either Wales or France (a few of the details are fuzzy) and standing on the wall, looking out over the countryside, and there was a military jet of some sort flying close to the ground in a loop across the valley, coming fairly close to the castle and then banking into a corner to continue the loop. I watched it doing these laps for about 20 minutes or so. Really cool.
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