So we can't just add places and photos of them outright? Not very social...
I'd like to offer this from my home town. Not earth shattering but it's cool. Therefore I CAN believe this isn't in the Geek Atlas but were this project to grow in scope then it should be there.
The Leviathan telescope at Birr castle, Ireland: built in 1845, it was the world's largest for 70 years, and arguably the Hubble space telescope of its day, in that it could see further, and fainter objects, than ever before, and was quickly used to resolve the structure of some nebulae.