A Great Olympic Games small wonder is a
great idea !
Not all Olympic games are memorable or even significant in the slightest, but some times nations make a Great Olympic Games in historically and strategically important moments.
Every nation should be able to build a Great Olympic Games once in their history and the wonder should give them [and their allies] a national/cultural boost and a boosted level for about 20 turns. In the history of the world this can be infact seen happening by using a little bit of imagination. Greece had it's Great Olympic Games in the time of the wars of survival against Persia and the games created unity among the Greeks city states and boosted their Hellenic national/cultural pride.
Germany made a Great Olympic Games in 1936 just 3 years before the second world war began and it gave the Germans (and their allied nations) a great boost in their national/cultural pride. Germany got 89[!] medals and if you
add the medals to the next 10 nations, then the medal count is 177 Axis medals, 106 Allied nation's medals and 20 Neutral Nation's medals. This is a huge propaganda victory to the Axis nations and even more as you compare the relatively small number and small populational size of the Axis nations and note that they still dominated the top 10 places in the world in these specific games. So in my mind The Great Olympic Games gives a boost to all the builders allied nations aswell. Some could even say that this boost saved Finland.
Finland had had a extremely bloody civil war just a few years before and almost all sense of national unity or belonging to a "Finnish culture" had dissappeared. A nation what was torn apart just a few years before got a huge restoration to it's national unity from the games. What makes this significant is that just 3 years after these Olympic games the Soviet Union attacked Finland and to the great supprise to the Soviet leadership, the formerly disunited armed forces of Finland had been restored to national unity and they fought united for Finland.
If we look at history we can see that other nations have made a Great Olympic Games in a very strategically wise point in their history.
For example the Soviet Union made a Great Olympic Games in 1980 in it's last death breaths in an effort to keep national unity and avoid the increase of the massive civil strife.
Medal distribution in the games: Soviet Union 195 medals and it combined to the next top 10 nations: Soviet Block nations 471 medals, Western Block nations 50 and Neutral nations 12. Even as some nations boycotted the games the propaganda effect and boost in the national pride of the Soviet Block nations was so huge that this effect can't be denied.