Hill House

Hill will be closed down next year, when the new college house next door will be ready to open for the Fall 2016 semester, and will undergo a complete 1-year renovation that will make it a much more pleasant place for students:

http://www.pennconnects.upenn.edu/find_a_project/planned/planned_g_to_m/hill_college_house_overview.php

And while it might not be to everyone’s taste aesthetically, it IS an architecturally significant building designed by one of the most prominent architects of the mid-20th century (he also designed the St. Louis Gateway Arch and Dulles International Airport):

https://en.wikipedia.org/wiki/Eero_Saarinen