attacking / defending GBs: 1% every second level (11,13,15)
FPs on Castel del Monte/Hagia: one every second level (12,14,16)
FP on Cape Canaveral: +1 every level
happiness: +4,9%
goods: +1 every level (= 2 unrefined: modern era and later)
coin/supply-boost (Lighthouse Alexandria/Royal Albert Hall/ St. Marks): +5%
Chateau Frontenac: +5% quest boost
Alcatraz: 9 troops at level 11 (higher unknown at the moment)
maybe less in higher levels