Apple is no stranger to the challenges of opening stores in historic locations, such as New York City's Grand Central Terminal. Its latest shop may be its most ambitious yet, however. The company has unveiled plans to convert Washington, DC's Carnegie Library into a retail store. The building hasn't been used as a book repository for a long time (it's currently shared between the city's Historical Society and the organizers at Events DC), but this would still be a vast undertaking. In the proposal, Apple would turn most of the Library into one of its shining beacons of modernity while (hopefully) respecting its 114-year legacy.