Baby fighting sleep!?

I really need some help. It seems like every day is just a never ending battle to get my daughter to go to sleep. Especially in the nighttime after her bath! She screams and screams for up to 4 hours or even more. It can't be very good for her because she hardly sleeps anymore. She just wants to see everything and when she does fall asleep, as soon as I put her down she'll wake up and start screaming and will be a repeat again!!