The history of this church is very interesting - it used to serve as a shelter for soldiers and also as a torture chamber of the Inquisition.
More information http://www.campeche.travel/iglesia-de-san-juan-de-dios/
Address 288 Calle 16, Campeche 24000, Mexico
Coordinates 19°50'36.519" N -90°31'58.577" E