If I read between the lines well, your question is more: Why has happened (for me here ofcourse) so much in a relativily small area compared to other places. What is the reason? This needs to my opinion more than just a historical approach, I think you must look for answers also more in the field of anthropology.
This is a bit my idea about it:
Conditions for humans to live are not equally divided in the world, some places prove to be more ideal than others, so geographical conditions play a very important role. For the basics of living you need in enough quantities fertile land, clear water, a moderate climate (not too hot or too cold), absence of lethal endemic diseases like in the tropics (a hot humid climate is ideal for germs) whiping out complete populations etc.
I think Europe in general these conditions are quite optimal:
- Moderate climate due to the influence of the warm Gulf Stream, especially the western part. So no real extreme temperatures and enough rain to guarantee crops keep producing enough food for a constantly expanding population.
- Mediterranian Sea forms the natural barrier between the Sahara and Middle East deserts and the land north of it. Easy to see the difference in terms of living conditions and cultural developement.
- Very long coastline compared to the land area. The sea is relativily not far away providing more variation in food and a possible alternative during periods of crop failure.
- Etc.
We have to go far back in time to understand that these conditions were vital in the period of the first settlements and made later the agricultural revolution possible. As soon as the basics are enough guaranteed to survive you also get enough time and energy for cultural developement. That´s what happenend in the past in Europe more than somewhere else I think.
- Lack of political and religieus monopoly. Nobody has ever claimed absolute dominance here and could kill competition
completely. Maybe for a while or maybe at a high degree, but at the long run it could always be challenged, however in some
places more easily than other places (hence the many wars).
- China and Russia has comparable natural conditions but are two vast areas of land and the political elite had to surpress people
to maintain power. This killed competition in both countries and slowed down cultural developement seriously. China was till
about Enlightenment (17th century) ahead of Europe in terms of technical developement, but came for a long period due to the
political aversion towards innovation (till recently) to a halt. Became for a long period isolated from the rest of the world.
- That possibility of internal competition in Europe has fueled cultural developement
intensively in many fields: warfare, art, science, democracy, technical improvements,
exploring the world etc. resulting in a whole lot of history!
- Giving structure to the competition like trading organizations / agreements or institutes like
patent offices, science associations etc..
Just a few examples, there are way more factors explaining why you have /had here so much cultural activity and developement. The book of Landes that I mentioned earlier is to my opinion a good introduction. I have to admit not readed it, but the Pulitzer Prize awarded book Guns, Germs and Steel, The Fates of Human Societies by Jared Diamond seems to give a lot of insight too. I hope this is a bit helpfull too.
It is not my intention to continu or start a discussion, it is just to give hopefully an interesting way to look to the question asked. Opinions are welcome ofcourse.