Holy crap. My family and I did a Euro vacation a few years ago and we stayed in the town of Grindelwald while we were in Switzerland. I think we rode the same trail as in the video in the summer, just on what were called trottibikes; basically giant scooters. It was scary and fun as hell.

https://www.jungfrau.ch/en-gb/grindelwaldfirst/trottibike-scooter/

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Speaking of the Harry Potter universe, it's pretty clear Gindelwald was pulling the strings behind the third reich. Dumbledore defeated him in 1945, remember? Voldemort is myopic selfishness incarnate, whereas Grindelwald and Dumbledore had a disagreement about the means to an end (of improving humanity).

Albus Dumbledore, whose name literally means "white hat", is almost purely good, while Voldemort is pure evil that doesn't resemble any real person, and Grindelwald is grey-evil.