Xunantunich means "stone woman" and refers to the ghostly apparitions that locals have reported for more than 100 years. This site is practically in Guatemala. You can walk to the border from here. The structure here is the second-tallest in all of Belize, behind only Caracol.
There aren't many visitors so it's a great opportunity to watch excavators work preserving the site. It's a beautiful area and can be reached easily from San Ignacio. When I arrived, I was given a private tour by one of the excavators, who answered a simple question by showing me around, telling me stories, and pointing out what was original versus rebuilt.