Small roller coaster on top of the Stratosphere Tower, Las Vegas
"Dismantled in 2005. ... Although there were never any serious incidents or injuries on the High Roller, the ride was well known for its frequent break-downs, and ... would frequently shut down temporarily due to high winds."
I have ridden the "roller coaster" on top of the Stratosphere (once) and the vertical accelerator on top (several times). The roller coaster isn't anything exciting except for when you look over the side, you're looking a loooong way down. The accelerator makes you think it's not going to stop and you're just going to keep on going until you hit the moon. Now THAT'S exciting. They also have (or had....) a ride up there that I just couldn't try. It was an "arm" that reached over the side with a car like a roller coaster car. The "arm" tilted out into space and the car rolled down a track on the arm until it hit the end with a jerk. At least, you
hoped it would stop when it got to the end. I couldn't do it......you have to draw the line
somewhere.... A few years back, the car got stuck at the end and those poor people were out there for a couple of hours (in the cold) until they could get it pulled back.
Originally, the Stratosphere planned to have a King Kong ride that had a huge Kong "climbing" up the tower on a track with people riding along (on it's back? in its fist? I don't know the particulars....) That fell through early in the planning. Pity. They had a "free fall" experience for a while where you jumped off the top, tethered to a pulley and would fall almost at full speed until gently coming to a stop at the bottom. I was tempted but it was pretty expensive.
I bid my rollercoaster-riding days goodbye with a last big bang when I was 65 by riding every rollercoaster in the Worlds of Fun park in Kansas City at least once, some twice, one three times. After that, the ophthalmologist said I had a choice.....rollercoasters or working retinas, but not both. Sigh.