Circus performer-turned-Egyptologist Giovanni Battista Belzoni made important observations about the flood patterns that had affected the valley for thousands of years. He theorized that many "undiscovered" tombs were in locations where they would be covered by flood debris and thus protected from both looters and the elements. On Oct. 6, 1817, Belzoni stumbled upon an incredible find — the tomb of Seti I, the most extensive and elaborate in the valley.  He was the first to step foot inside the tomb since robbers had plundered it almost 3,000 years before. Belzoni took note of everything he saw and made drawings of the different chambers of the tomb, which are highly useful today as years of deterioration have obscured the original images. Belzoni also made a general map of the Valley of the Kings and the entrances known at the time.