What mysteries lie in the attics of the city's historic sites? Ever wonder what is behind that brick wall? In honor of National Preservation Month, explore spaces not normally open to the public at Gadsby's Tavern Museum, Carlyle House, Lee-Fendall House, and the Apothecary Museum. Tour highlights include historic graffiti, hidden architectural fragments, and alleys that connect the city. Held each Saturday morning in May, starting either at Lee-Fendall or Gadsby's. Tour includes walking over many city blocks, climbing stairs, and access to confined spaces. Walking shoes are a requirement. Held rain or shine. All sales final.