When most people think of the Acropolis, they probably envision, first and foremost, the temples of Athena (the Parthenon, the Erechtheion, and the temple of Athena Nike) on the top of the citadel. But it is important to realize that the slopes of the Acropolis were also home to many sanctuaries that played vital roles in the religious lives of the ancient Athenians. Some of these cult places, especially on the South Slope, received monumental, architectural embellishments (for example, the sanctuary and theater of Dionysos, the sanctuary of Asklepios). But many shrines on the slopes were much simpler in nature, of the sort that scholars sometimes call "rustic", and were places where divinities of nature, fertility, and healing were worshipped on a less monumental and more personal level. This type of "popular" religion is attested vividly on the North Slope of the Acropolis, where many shrines were nestled among the steep cliffs, caves, and pathways. For example, at the northwest corner of the North Slope, Apollo, Pan, and (probably) the Nymphs were worshipped in shallow caves. The Klepsydra Spring House, mentioned in Aristophanes' Lysistrata (910-913) and other ancient literary sources, was also probably sacred to a nymph (originally called Empedo). Farther to the east, Eros and Aphrodite had an open-air sanctuary. Evidence for other shrines is provided by numerous rock-cut niches for the dedication and display of offerings to gods whose names we do not know. The sacred spots on the slopes of the citadel were connected by an ancient path, called the Peripatos, that circled the Acropolis and intersected the Panathenaic Way at the western approach. It is also likely that most (if not all) of the North Slope was within the sacred area at the foot of the Acropolis known as the Pelargikon.