One famous aspect of Karnak, is the Hypostyle Hall in the Precinct of Amun-Re, a hall area of 50,000 sq ft (5,000 m2) with 134 massive columns arranged in 16 rows. 122 of these columns are 10 meters tall, and the other 12 are 21 meters tall with a diameter of over three meters.

The architraves on top of these columns are estimated to weigh 70 tons. These architraves may have been lifted to these heights using levers. This would be an extremely time-consuming process and also would require great balance to get to such great heights. A common alternative theory about how they were moved is that there were large ramps made of sand mud brick or stone and the stones were towed up the ramps. If they used stone for the ramps they would have been able to build the ramps with much less material. The top of the ramps presumably would have either wooden tracks or cobblestones for towing the megaliths.

There is an unfinished pillar in an out of the way location that indicated how it would have been finished. Final carving was executed after the drums were put in place so that it was not damaged while being placed. Several experiments moving megaliths with ancient technology were made at other locations – some of them are listed here.

http://en.wikipedia.org/wiki/Karnak