Gravel Hill is one of several houses built in Charlotte County by the Dabbs & Thomas firm of Richmond in the 1840s. George C. Hannah’s mansion looks quite familiar, but, on closer inspection, has a number of unusual features from the Greek Revival style: a fully articulated, but idiosyncratic, Doric portico, vertically connected paired windows, diamond-paned door cases, two dissimilar stairs, and a plan of unlikely originality. A large 1914 addition was crafted with equally self-assured bravura. An earlier structure is included in the rear wing. On the Charlotte County property are imposing old trees, a rustic log guesthouse, a well-preserved smokehouse, an important barn, and the remains of an elaborate early-20th-century formal garden.