Octagon House

Octagon House is at 919 Charles St. This 1854 dwelling includes five floors furnished with antiques. The house was constructed with central heating and running water, and contains a central 40-foot circular stairway. What is considered to have been the nation's first kindergarten as certified by the Library of Congress also is on the grounds and is furnished in period. A late 1800s barn, moved from the old Watertown-Milwaukee Plank Road, houses farm implements and exhibits.

Guided tours are available. Time: Allow 1 hour, 30 minutes minimum.