I've seen all the Space Shuttles in their retirement. It took me 10 years to get to them all.
But I saw Endeavor when it was still just on the ground (like Discovery). I can't wait to go back and (re)complete my collection!
Interestingly, with this display, you can now see the shuttle in all operating modes:
Endeavor is in launch configuration, Atlantis is in orbit configuration, and Discovery is in landing configuration. And if you count Independence at JSC, you can see it in transport configuration.
Oh man, when they moved Endeavor through the streets of LA it was like a championship parade.
Your collection is incomplete as you have not useen the Space Shuttle pass through a Wendy's drive through, the extremely rare and unlockable, hidden operating mode.
Reminded of Randys Donuts: https://commons.wikimedia.org/wiki/File:Space_Shuttle_Endeav...
On the ground or suspended about 20 feet up? I saw Endeavour in 2017 and it was like this and you could walk under the wings. I've seen Discovery about 10 times because I live much closer to DC but you can't only walk around it, not under it.
https://imgur.com/a/eUR7TU1