It may not be the coolest, but my local volunteer fire company (Rescue Fire Company of Cambridge, Maryland) has been doing a holiday train garden for over 80 years. It has Lionel 3-rail trains, a lot of buildings, and some scratchbuilt local landmarks. It's the coolest for me because of the nostalgia involved with going to see it every year since I was 4 or 5 years old, and it's a big part of what got me into O gauge trains. I don't have any photos, but I'll try to find some.