I took a single day tour to visit the ruins of Coba. I didn't have a guide at the time, just spent about 2 hours, enjoying the site all by myself.
Although it's hard to hear, the pyramid of the magician has a really strange reverberation when clapping. It only works if you stand directly facing the center of the pyramid.
It sounds almost like a rubber band but one that would be 10 feet or larger, snapping itself.
The site is quite large, and well maintained.
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