High bridges with super structures at the apex. OR just narrow high bridges. It isn't so much heights, they bother me but to the degree NT's fear heights. There is a bridge on 301 at the border of MD and VA that almost sends me into a melt down, I have to have my wife drive over it when we go that way. I take a longer path to avoid some bridges. Most I can desensitize to, but that "Harry Nice" bridge makes me about have a heart attack.
The cable car at Santorini, Greece was the most scared of heights I have ever been in my life, it is the only time I have closed my eyes and just waited to die from the stroke I knew was incomming. My family didn't understand that I was so shaken by that that I couldn't enjoy the next few hours walking around the beautiful island, I just went inside myself and kind of followed them. If I ever go there again, I am just staying on the boat.
I don't understand it since I love flying in airplanes, even low altitude flying. It is something about being above the ground with something higher then me near me. Once I get above the tree tops, I love it. Totally illogical and something I spent years trying to desensitize. I took up mountain climbing (not rock climbing), discovered flying, went by myself and camped for a week at a time on a high mountain top and would walk over to the cliffs every day.
Snakes I am phobic of as well, but that is pretty common in all personality types. I tried to handle friends snakes to get over this but I am comfy that this is a "socially acceptable" phobia so I have come to terms with it.
I hate being scared, so when something gets me, I face it and fight it, I just haven't beaten the whole Harry Nice bridge thing. I hope the engineer of that span died pennyless and alone.