CONSTITUTION USA WITH PETER SAGAL
PBS, 9:00 p.m. ET
SERIES FINALE: In “Built to Last,” host Peter Sagal examines the longevity of the U.S. Constitution by exploring how difficult it is to amend it, and how resilient it is in the face of extreme challenges to it. For this final episode in his painlessly informative documentary series, Sagal visits both Iceland, where that country’s leaders recently used the U.S. Constitution as a model to rewrite their own, and the history of Watergate. Only one of those locations, though, can be reached directly by motorcycle. Check local listings.