Avshalom Cave Nature Reserve A.K.A. Soreq Cave or Stalactites Cave is a 5,000 m2 cave not far from Beit Shemesh.
Though it is not huge, Avshalom Cave, in my opinion, is one of most beautiful nature reserves in Israel. A visit will not take much time, but it will surely leave an impression. You can visit it on your way from Tel Aviv to Jerusalem or when traveling in this area. In any case, my recommendation would be not to skip this hidden gem.
For additional photos and description see: http://www.israel-in-photos.com/avshalom-cave.html
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