Cenote - a natural well

Hello all! Yesterday I went on a long day trip across Mexico to visit some Maya ruins and more. On route to the ruins we were treated to a short stop at this 'cenote' - which is a natural well. The wells are formed when the roofs of caves fall in, and there are around 3000 all across Mexico (some larger than others).
The one we visited was at a place called Ik Kil. The well is an impressive 160ft deep (around 40m). When European/American explorers first arrived in Mexico (in around 1840), they brought divers in to explore the cenotes, and found that the Maya people had thrown precious belongings/carvings into the wells - presumed as offerings to the Gods. In a way - like a giant wishing well!