I visited Chichen Itza on the solstice, a couple of years after they discovered that the shadow of the serpent along one side of the steps was connected head to tail for a few minutes by the sunlight/shadow just once a year.
Other than that almost supernatural event, the second most vivid memory I have is of the screams of tourists climbing the interior steps. There were bare lightbulbs every ten feet or so on the ceiling of the low stair passageway leading up to the original top of the pyramid, where the jaguar sat in a large chamber. The stairway was wet from the Yucutan humidity and all of the tourist's breath and sweat, so people gripped the walls and ceiling to avoid falling.
Because the lightbulbs were not in protective cages, a significant portion were broken by people bumping into them. Fairly regularly you would hear a scream from someone sticking their hand into a live socket where there was a broken lightbulb. It was a situation that could only exist in a minimally litigious society.
There were few signs of anybody trying to restore those lightbulbs.