How many times have you walked past a Charleston home and wished you could see its interior? Well, here's your chance. For the past 36 years, the Preservation Society of Charleston has been opening doors to some of downtown's most famous locales, including church gardens and private residences that date back to the early Georgian period. Choose from 20 unique tours during the five-week event. Preservation Society of Charleston, 147 King St. Sunday, times vary, $45. (843)722-4630, www.preservationsociety.org