One that should be added to the list is Newgrange. I have visited it many times and am still amazed every time I see it. It is older that the Pyramids.
For thousands of year, ever winter solstice, the sun rises over the horizon and shines directly down the shaft eliminating the chamber. Every year in Ireland there is a lottery for 20 to enter the chamber to witness the event. It happens for 5 days lasting only 17 minutes, then goes back to total darkness for the rest of the year.
It is a world wonder and should be on the list.
http://www.mythicalireland.com/ancientsites/newgrange/