Final answer:
The BU Castle is located on the Boston University campus and was completed in 1915. The basement of the castle houses the Howard Gotlieb Archival Research Center.
Step-by-step explanation:
The BU Castle is located in Boston, Massachusetts, on the Boston University campus. It was completed in 1915 as a private residence for a wealthy Boston family. Now it serves as a meeting and event space for the university.
The basement of the BU Castle houses the Howard Gotlieb Archival Research Center, which contains collections of manuscripts, rare books, and other materials related to literature, journalism, and the performing arts.