Commercial excavators often find that their way back to the past runs through relatively recent structures. What should we do with them? Intellectually sensitive modern excavators, like our authors, are beginning to convince us that these recent constructions not only matter in themselves, but may have interesting links to what lies beneath. Here they introduce us to the foundations of an early telescope, a monument that takes its context both from the much-investigated lands of West Cambridge, and the more abstract landscape of early science. Forcing archaeology to ask fresh questions and make ambitious connections is only proper in a place heavy with the aroma of investigative scholarship.