14 Henrietta Street is one of Dublin's best social-history visits: a grand 1740s townhouse that later became a crowded tenement. Its rooms trace the city's shift from Georgian power and money to 19th- and 20th-century inner-city poverty.
Visits are by guided tour, which is the right way to see the house. The story is not just about architecture; it is about the people who lived in rooms like these, often several families to a floor.