Located on the east part of India filled with lush greenery, with history from Maurya era there are lot of temples, museums and waterfalls to visit. You can check jharkhand official tourism website for lot of info about this spot. Coming to your second question here is a list of waterfalls to explore in Jharkhand Hudru falls
Usri falls
Lodh falls
Panch gagh falls
Dharagiri falls and Rani falls, Sita falls and Dassam falls.