There are two Cascadas del Purgatorio, the Lower one (here shown, but not at its best) and the Upper one. They are located close to Rascafría and the Monasterio de El Paular, in the Madrid province. The Monastery dates back to 1390 and is worth a visit if you like historical and/or religious architecture. You can visit both attractions on the same day and return to Madrid unhurried.
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