Well, we had planned on exploring more of Petra today, but it was very hot with very little breeze and a lot more tourists, so we ended up just walking the length of the Siq and back. We did take a horse ride (included in the admission price) down to the entry of the Siq. This is a picture of the tunnel, taken from the bridge, that was built to divert water from the Siq in the event of flash floods. Before this was built there was such a flood and a group of French tourists were killed. When they were excavating to build the bridge and tunnel, they discovered that the Nabateans had already done that.