In the Maya ruins of Chichén Itzá, Yucatán, Mexico:

And by Great, they do mean Great — this is the largest ball court in the Maya realm. It’s so large, in fact, that archaeologists think it may not have been useable for the ball game — instead being used for ceremonies associated with the game. Meanwhile, Chichén Itzá has plenty of other (smaller) ball courts that could have been used for the regular game.