I was on a mountain with 3 caves in sight. Each cave had a stone statue at the entrance. The entrances were very tall, and so were the statues. The statues were the guardians of the caves. I couldn't enter two caves as the guardians prevented me from going in. The cave that I did go in to had a dwarf like statue, like the one from The Hobbit. I went in, and it lead underground. It was very dark and there was a big pool of water. I was at the end of the line for a roller coaster. It was no longer dark but it was sunny with a blue sky. I was telling someone that this is my second time riding this. Which reminded me that there's no line at all, it's just empty unlike the first time. I got in, and the ride began. There's a drop and it felt so real. I had to hold on to the side of the roller coaster and that's when I realize something's wrong. The bar wasn't down for my seat. Or anybody's. I yelled that the bars are not down. I told someone to press the emergency button. I checked for it on the ride's ceiling on my side (there's not a ceiling). I then checked the front and saw it right above someone. I yelled for the front to press it. The guy right under it pressed it. I saw the word "cancelled" flashed on a rectangular screen on my left. The ride turned back around.