During the pre-hispanic era, this spot housed the spectacular Cincalco cavern (the place of corn cave), that led to the Mictlán, considered a portal between the world of the living and of the dead by the Mexicas. They also believed that Tláloc, the god of water, lived in this hill. According to native sources, Huémac the last Toltec governor, took his life in this cave in the year 1162, after experiencing first hand the demise and ruin of the Toltec people. This space is thought to have protective powers and to energize visitors. To this day, the cavern remains sealed for security reasons.

The old stairs used by the Emperors Maximilian and Carlota to exit the castle can be seen next to the Audiorama.

The construction of the Audiorama dates back to 1972 and was set up as a haven for book lovers. The chronicler Salvador Novo named it by the náhuatl moniker “In xochitl, in cuicatl” (Within the flower, the song). The fresh scent of damp earth can be perceived upon entering, and from its comfortable benches, the natural landscape can be observed.

The Audiorama´s main attraction is the background music, which is why a special selection is made every day: On Tuesdays new age is played, traditional Mexican rhythms on Wednesdays; melodies from Spain, Greece or Brazil on Thursdays, jazz on Fridays; chill out for Saturdays and classical music on Sundays. The gardens are full of wild plants, fruit trees, small rose bushes, and calla lilies. Visitors may request to borrow a book free of charge and read it on-site.