certain that it is the tomb of Annia Regilla. The construction is of red and yellow brick and there are two floors, with significant remaining external decoration. In the Middle Ages, it served as a hay loft for a neighbouring farmhouse. Valca Tower. This building is constructed from rectangular blocks of tuff and dates back to the 12th or 13th century. It was protected by a first wall of defence and a drawbridge. The tower is believed to have been part of a fulling mill. Roman cistern. Constructed around 100 AD and originally underground, this cistern was exposed when earth moving was carried out for the construction of the nearby Circus of Maxentius. Columbarium of Constantine. This columbarium, a building for housing the ashes of the deceased, dates back to the 2nd century AD. During the Middle Ages it was converted into a mill. The Sacred Wood is a spot on a hill overlooking the valley and with good views of the mountains surrounding Rome and the Castelli Romani. According to tradition, this is the spot at which Herodes Atticus ordered a sacred wood to be planted. Church of Sant'Urbano alla Caffarella. A 7th-century church built over a 2nd-century pagan temple. See also List of parks and gardens in Rome References External links La Valle della Caffarella on Appian Way Regional Park website Flickr Wildlife set Caffarella, Park of the Rome Q. IX Appio-Latino