The Maine Historical Society's self-described "history campus" includes three buildings lined up along busy Congress Street in downtown Portland. Most local residents never give these buildings a second thought, but they're important. The austere brick Wadsworth-Longfellow House dates from 1785 and was built by Gen. Peleg Wadsworth, father of the noted poet Henry Wadsworth. It's furnished in an early-19th-century style, with many samples of Longfellow family furniture on display. Adjacent to the home is the Maine History Gallery, in a garish postmodern building (formerly a bank). Changing exhibits here explore the rich texture of Maine history. And just behind the Longfellow house is the library of the Maine Historical Society, a popular destination for amateur genealogists and Portland buffs. You have to be a history nerd to appreciate this place, but it's gold if you are.