This unusual, eight-sided, cupola-topped house of interest to architecture buffs dates from 1861 and is maintained by the National Society of Colonial Dames of America. The architectural features are extraordinary, and from the second floor it is possible to look up into the cupola, which is illuminated at night. In the small museum, you'll find Early American furniture, portraits, silver, pewter, looking glasses, and English and Chinese ceramics. There are also some historic documents, including signatures of 54 of the 56 signers of the Declaration of Independence. Even if you're not able to visit the inside, this strange structure is worth a look.