This 1780s five-part Georgian mansion, which once sat on 9,000 acres, was built by the grandson of an indentured servant and was grand enough for George and Martha Washington and Abigail Adams to spend the night. Now part of Prince George's County Parks, it has been restored to what historians think it looked like in the 1830s. The setting, now just 90 acres, is an idyllic green spot -- which blazes orange and red in autumn. Christmas candlelight tours with rooms decorated by local garden clubs make the place festive. Children's hands-on programs and a boxwood maze keep kids occupied. Also on the property is the Montpelier Arts Center (tel. 301/377-7800), which offers art exhibitions and performing arts events.