I have a Minecraft world called "hotel", but when i open up my saves folder, the world isn't in it. I am on a mac. Where can I find it?
Sometimes, a world has a different world name than that of its in-game name.
You can see the folder name of any world by looking at the name next to the date. As you can see in this picture, the title of the world is different to its folder name, which can be found next to the red arrow.
Simply look in the 'saves' folder for the folder name of your world.