They are rebuilding what is known as New College on campus. (New because it is allegedly the second building built, adjacent to what is called Old College.) Over the summer, while working in the basement, they found evidence of an even older building that was on the same site. (I cannot tell you how badly I wanted to go see that, but with no journalistic or academic reason to ask, I didn’t.)
But at certain times, you can see glimpses of what is a nearly 200 year old building.