I went to a different part of a town about 10 miles out form home. Saw a "trail" that I had never sen before on Google maps, thought I'd check it out. It was at the bottom a pretty tough hill, so no problem getting there. Come to find out the "trail" was actually a concrete culvert with about 2 feet of clearance to the roads it cut under. I had to trudge back up the hill I just came down. Would of been cool except it was crappy chip and seal with gravel patches where gravel driveways washed out down on to it. Nothing to see either.
Sometimes like the OPS experience it can be an adventure of sorts though. I spotted a road I had never noticed cutting through to a lane I had already been on, I could not for the life of me figure out where this came out at, I could not remember seeing the road from the other side. I went down the road that lead to it, down a giant hill and came up to a cattle fence completely blocking the road. It even had a name on the maps too. For some reason it was cut off and not even anyone from the city knew why. Later that year I tried to figure out where it came out on the lane on the other end. I spotted another closed lane, little more than a cattle trail only about 1 car width wide with a big swinging gate blocking it. I made a few loops in front of it to "mark" it on my GPS and when I checked it out in SportTracks it WAS the entrance of the road. To this day anyone I ask about it seems to know nothing about it.
Now I usually scope out a "new" route in the car first, THEN try it on the bike if it pans out.