Ha ha ha!
You don't need a Ph.D for that door. I'll translate for you.
"You must be riding a horse to enter. If so, go straight ahead. Have the horse pull the door open."

The other door's signs say, "If you're going around in circles, Stop. Instead, go down the hallway to the left. Security will help you leave as you're possibly unstable."

You get to run the tours? That's cool. You get to go into one of the top scientific facilities every day.
Looking forward to tomorrow's pictures!