In 1497, Leonardo finished his fresco of The Last Supper on a wall in the Convent of Santa Maria delle Grazie. Around 1650, the monks decided they needed a new doorway into the refectory, so they carved one right into the fresco.
On August 25, 1875, a 27-year-old former British naval officer named Captain Matthew Webb smeared himself with porpoise oil and became the first person to swim the English Channel. It took 22 hours to swim the 39-mile distance. On July 24, 1883, he attempted to swim the rapids below Niagra Falls and drowned.