On our day trip around Haifa, we stopped at this Beit She'arim National Park to see it was all about. What attracted us was the Necropolis... a bit morbid, yes. As you follow the circuit, you notice all of the tombs carved into the rock... they're nice, but not particularly spectacular.
However, when you reach the last burial complex, this is were the amazement begins. The last tomb is the largest with a 50 meter central corridor, from which numerous halls branch off and hold around 130 carved limestone sarcophagi. It was really pretty to walk through.
Dom also discovered that it's also an acoustically perfect place to sing and listen to your echo ;)