Hymettus, also Hymettos (pronounced /haɪˈmɛtəs/ in English, Greek: Υμηττός, transliterated Ymīttós, pronounced [imiˈtos]) is a mountain range in the Athens area, East Central Greece. It is also colloquially known as Trellós or Trellóvouno (crazy mountain), a name of uncertain origin. In antiquity there was a sanctuary to Zeus Ombrios (Zeus the Rain God) on the summit with numerous offerings dating especially to the 8th-7th centuries BC; they are on the site of a military base and not currently accessibe. There is also an ancient quarryman's hut on the western slopes of the mountain, one of two buildings in ancient Attika which preserves its roof.  

http://en.wikipedia.org/wiki/Hymettus