I ran across this lengthy photo comparison article regarding various shaped ancient metropolis and foundational city architecture. Some of it requiring more cut stone that used in Giza pyramids... Thanks for posting the MESSENGER images... seaching for more data.
MESSENGER Sends Back First Image of Mercury from Orbit
MESSENGER has delivered its first image since entering orbit about Mercury on March 17. It was taken today at 5:20 am EDT by the Mercury Dual Imaging System as the spacecraft sailed high above Mercury’s south pole, and provides a glimpse of portions of Mercury's surface not previously seen by spacecraft. The image was acquired as part of the orbital commissioning phase of the MESSENGER mission. Continuous global mapping of Mercury will begin on April 4. [more]