Coimbra is a City

Coimbra is a City in Portugal. it is very famous for historical places, old things, attractions, universities, museums, art, and other things. at the time, I have decided I will going to enjoy the christmas bus tours there. I am very happy and excited. but I have no idea about its attractions, so my dear friend, if you don't mind do you have any idea about its attractions, if yes so share here your experience with me. I will be waiting for your response.