A small, free museum housed in a former 16th-century chapel a few blocks east of the plaza. The exhibits cover Valladolid's pre-Hispanic Maya past, the Spanish founding of the town, and the role it played in the 1847 Caste War — the indigenous Maya uprising that began in Valladolid and shook Yucatán for half a century.
Display panels are in Spanish only, but the artefacts — ceramic urns, colonial documents, henequen-trade equipment — speak for themselves. Allow thirty to forty minutes. The building itself, with its high vaulted ceiling and stripped-back stone walls, is worth a look in its own right.