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When the Hotel Posada del Mision was remodeled in 2013, workers digging below the foundation discovered an opening into a huge cavern. They called engineers, who called INAH (National Institute of Anthropology and History) who determined that the cavern was a mine dug by the Chontal people, who had deliberately closed it in advance of the invading Spanish conquistadors. Veins of silver and gold can be seen in the tunnels as guides take you through them. Several tunnels remain to be explored. The tour ends in the hotel bar where you can have a margarita and admire the famous mural of Cuahtemoc by Juan O'Gorman.
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Historic building built by Jose de la Borda in 1759, the building now serves as a museum and cultural center hosting an experimental theater and exhibits of sculpture, paintings and photography by artists from around Guerreo.
The museum contains some pre-Hispanic artifacts from the collection of an American sculptor and silversmith, William Spratling as well as some of his work.