Archaeology buffs will appreciate the Ruinas de Quelepa, grassy mounds covering 40 terraced ceremonial platforms, largely unexcavated. Lenca inhabited the site between the 2nd and 7th centuries AD, trading with Copán in Honduras as well as Mexico. Stone sculptures uncovered here are on display in the Museo Regional del Oriente .
The ruins are 8km west of San Miguel off the Interamericana. From the cathedral, bus 90 to Moncagua (US$0.60, 30 minutes) passes them.