No real interesting tales here, but a few unique caches.
I have done caches in 18 or 19 states, Canada and Japan. My finds include the very first geocache site, which is located just outside of Portland, OR, and the first geocache in Canada, which is in Nova Scotia. Also did a "drive thru" cache in Las Vegas, as well as several "virtual" caches on the Strip in Vegas.
Urban caches can be very challenging. I have done several that really took a lot of searching and thought (and there were several that I never was able to find). Most urban caches are micros, and it can take some creativity to hide one in a busy area, keeping it accessible to cachers, and hidden from "muggles" (non-cachers).