Chris - Your dream images have so many associations that I feel you will need to explore them - For instance a bridge is a way between opposites or a different life situation, memories, job, relationship or even enemy. That the stadium is in the middle suggests it is neither one side nor another and is the centre of your attention - even to being lit up.
The mouth is a fundamental part of life. It takes things in such as food, pleasure or even pain. Basically the mouth is a pleasure area, but it is also the way you express pleasure or pain, as with smiling or grimacing. So the mouth is a way you communicate as well as satisfy yourself or gain your needs. As an organ of expression the mouth can also give thanks for life and utters beauty in words or sounds. This is a way you can uplift the dark things in you and transform them. So in your dream it adds to the richness and complexity of the images. So see
http://dreamhawk.com/dream-encyclopedia/acting-on-your-dream/#BeingPersonThe coliseum again is an amazing mixture of associations, linking with the far past, its way of life, tortures and grandeur, so may indicate bad or even amazing memories from your past. The simplest of dream images can have massive information latent in them. See
http://dreamhawk.com/dream-encyclopedia/the-conjuring-trick/The last image of the girl in the cage has more connections with the coliseum perhaps. Can you be the Androcles and the lion in your dream, or be one torn by the past.
Tony