Three temples built one atop another across Dilmun's centuries: Barbar — altars and terraces of astonishingly dressed stone, and the sacred spring well with its sunken stair where ancients read sweet deep water as divine miracle (the famous bronze Barbar bull now in the National Museum). The raised walkways read the three layers with ample panels; half an hour suffices — pair with Bahrain Fort minutes away for the complete Dilmun duo; finish the story before the original bull at the museum.