Ancalagon
Dusty Dragon
I had this idea for a campaign I thought of as "double Earth". As in, it was a fantasy version of Earth but all the geography was doubled. So the mountains were twice as high, the oceans twice as deep, the distances between civilized cities were twice as far. So basically you could have fantasy versions of all the Earth civilizations (Magical India!) that were the same size and population as historical equivalents, but there would still be HUGE gaps of untamed wilderness between India and Persia, or between fantasy Persia and fantasy Arabia.
Plus the mountains being twice as tall meant that they became unbreathable to humans only half way up their slopes, with the high peaks being the realm of Storm Giants and dragons. Same for the deep forests, the jungles of the Amazon or Africa, Arabia's desert, etc.
That doesn't sound like much, I know, but I was jazzed at the idea of using all of the historical and mythical material I had available. I had just read parts of the 1,001 Nights and bought a copy of Yoon-Suin, which I was going to put in place of Dhaka (Bangladesh).
I still want to use this one day, and probably will.
My next campaign will be in Yoon Suin and I am stepping away from the historical / geographical accuracy thing (I need a change). However, the real world is still a useful resource. How is the weather like in the Yellow City? I don't know, but the internet can tell me all about the weather in Dhaka!