Field archaeology is normally associated with outdoor excavation and exposure to natural environmental conditions. Archaeological excavations have adapted to a wide spectrum of these conditions, but the recent prominence of archaeological sites as tourist attractions and educational facilities has occasionally led to dramatically different environments for the archaeological excavation, recovery, interpretation, and preservation of evidence, including facilities that permit indoor excavation. This article explores 15 years of experience at the Mitchell Prehistoric Indian Village in South Dakota. An Karr 2 "Archeodome" covering part of site represents an example of a non-traditional excavation and preservation environment that presents considerable benefits and challenges for archaeologists. This provides the basis for evaluating the nature of indoor excavation within its archaeological and educational context, and provides a cautionary note for archaeologists, heritage groups, tourist boards, and others interested in the preservation of archaeological sites. Though this article focuses on the Mitchell site, the information reported has broad implications for sites where structures cover archaeological deposits.