A technical university in Merida, Yucatan, Mexico wanted to build a new basketball court. When they started construction, they encountered a 1,500+ year old Maya ball-court (nice bit of irony there). The technical school has had to move the location of their proposed basketball court because of the presence of the Maya ball court.
There is a report (in Spanish) on the INAH website, which can be seen here. There is apparently, a nice slideshow at that location (click on the camera icon under the main picture). And, I say apparently because I can't access it from my work computer (an archaeologist can't access a site that discusses relevant archaeological findings!).http://www.inah.gob.mx/boletines/14-hallazgos/7107-descubren-juego-de-pelota-en-yucatan