Melchor de Mencos
Melchor de Mencos is in Guatemala on the border with Belize and is usually a place that most travelers merely pass through, but it does have some stelae and zoomorphs in a square not far away. From the border, go to the first main road to the right. It is off to the right maybe a 20 minute walk away.
If you are travelling from Belize in your own vehicle, you will be asked for money at the bridge coming into the town from the border. Pay 10Q at the most.