Yeah, I wouldn’t recommend looking at these pictures if you’re afraid of heights. A group of self-described “hot tub enthusiasts” in Switzerland has gone ahead with one pretty extreme plan: using a hot tub that has been suspended some 600 feet off a bridge. They selected the Pont du Gueuroz, which was one of the tallest bridges ever built at the time of its construction.
They started work on their system at 4:30 a.m. on October 1. Four and half hours later the first person went into the hot tub. The last person came out at 6:00 p.m. 25 people participated in the experiment. More pictures are here.
They also constructed a jaccuzzi at the summit of Mont Blanc.