While laying on the beach stargazing my wife and I observed two transparent triangles We saw two transparent triangles - very large about the size of a football field hovering around at around 500 feet give or take - no sound - we had left our cell phones back in our rental - we went to go get them after about 10 - 12 minutes of watching them - the rental was on the beach but about a 10 minute walk there and back - by the time we got back they had left