Keith, the Greek columns were drums, stacked with central pins. Many of the Roman columns were done that
way, too. The Pantheon was a real showpiece, and the guy that most historians say designed it was amazing.
A 140 clear span concrete dome that still stands, perfectly intact. Pretty much the only Roman building that was never
destroyed by barbarians or earthquakes. Intact and still in use after 2000 years. The did redo the interior plaster
on the ceiling interior in about the 1700s, it was starting to crack after 1700 years. Shoddy workmanship, apparentely.

Original floor covering stone, from what I have been able to find out. The building astounded me when I first
visited it in the 8th grade, I had difficulty grasping that it wasn't rebuilt or refurbished, and that even the huge bronze
doors, which are swung closed each evening and open each morning are the originals. Like 20 ft tall by 8 ft wide
and 6-8" thick bronze.

There is nothing about the building that isn't amazing.
Most historians think they did the columns in one piece just to show off that they could, and took slightly too big
a bite with the original 49 ft columns in one piece, so backed off to 39 ft and lowered the portico 10 ft. You can
see how the portico was lowered.
If you cut a square, flat bottomed notch on each log, they will lay fine. Look at a set of Lincoln logs. Flat on flat is
way easier to cut.
Bill