What is an overview of what the kinds of things the beasts in Revelation represents?

I've asked many people this question, but they all have different opinions. Some say that the beast is a disease or war or something along that line. Others tell me that the beast is an actual beast. I am looking for answers among the broad spectrum of all denominations Christianity. I know there is no way of knowing, but I would just like to know the different beliefs about the *kinds of things* the beast might be. This question refers to ALL of the beasts. I would also like to know what types of denominations think that the end of times have already come.