Walt Disney World
I actually put this Epcot dual-monorail photo on my "shot list" after seeing a jaw-dropping image in a WDW souvenir book, but I quickly realized that I had a snowball's chance in hell of getting the shot given how the monorails actually operate. That shot is probably a dawn "Yellow Shoes Exclusive" of parked monorails.
Capturing the shot required the most patience I've ever had. Sarah and I were stationed about 10 feet from a security guard while waiting for this shot. I don't know how long we waited, but it seemed like an eternity to me. At one point, about 3 minutes before I got the shot, the security guard told us we needed to head out, as they were clearing the park. I told him that we just needed two more minutes, and he said something (I don't recall what), so I told him, "just about 30 more seconds." The longest three minutes of my life later (all the while I was fully expecting to get a tap on the shoulder), I got the shot. Phew.