Am deep into the future techs by now, one thing that strikes me is how important coal is, as opposed to other resources.
Anyone would want factories in as many cities as possible, however when you also need 2 coals for every beam foundry, it quickly becomes a problem to manage the resource, unlike iron, horse or aluminium which is extremely abundant.
Oil doesn't show up on the strategic resource for some reason?
Only Uranium need the same kind of managing as coal.
On another note, the archology building seems broken: 2760 maintenance and provides 40 gold per pop? City needs a pop of 69 to break even (My largest city on turn 670 is 65)... Does seem worth it for the 8 great engineer points that late in the game...
Edit. Got around to actually building the archology in my capital, which has a pop of 60, turns out it gives a surplus of 2k gold, which isn't too bad. Guess it comes from all those +X% gold buildings.