The ruins of Lubaantun, a Maya city that thrived from around AD 700 to 900 but was abandoned soon after, are somewhat unusual in a country where Maya ruins are almost common. Black slate is the primary building material. There’s a noticeable lack of mortar and a large collection of miniature ceramic objects has been found over the years. It is the largest Maya site in Southern Belize and has become well known for its strange style of construction. Lubaantun is also where the controversial crystal skull was supposedly discovered by Anna Mitchell-Hedges (though that’s since been almost entirely disproved). Visitors are free to wander the site, where there is a small visitor center and an admission fee of $10.