I too have travelled a bit. I taught Chemistry for two years in a private school in Switzerland. I got to travel to a lot of interesting places. And I got to do a few interesting things. The Pont du Gard was built over 2000 years ago. It was built by the Romans as an aqueduct to carry water to the ancient Town of Nimes. The top is about 2 metres wide. I walked across the top from one end to the other. What was I thinking?