Compared to some of these other places, mine are kind of tame, but still crazy for me!
In the stairwell at work with a coworker who was a semi-regular thing (best part is the building was only two floors so chances of getting caught were fairly high - although we did use the roof access stairwell so we had an extra set of stairs to hide on...)
Restroom at Starbucks - large and fairly clean. First time was with a married co-worker - we walked there on break, went in, fucked, bought a coffee and left.
Family restroom at a sports stadium. We walked all over looking for one. Now, there’s always a posted attendant ...
Same Starbucks - different co-worker (I enjoy my coworkers)
Parking garage at train station a number of times
Parking lot at work (new job, new co-worker - she never had sex in a car before, recently married, and never had a guy have more than one orgasm - took care of all that) (although I do wonder if the cameras caught anything ...)