Harmony Museum on Mercer Street in Harmony offers regular guided tours from 1 to 4 p.m. daily except Mondays and holidays; reservations are suggested for weekends and required for groups. Call 724-452-7341 or 888-821-4822, or visit the Web site, www.harmonymuseum.org.

<B>Pittsburgh Children's Museum</B>, 10 Children's Way, Allegheny Square, continues "Bob the Builder — Project: Build It" through Sunday, although the museum will be closed today and Friday, as will most downtown museums, due to the G20 Summit. Regular museum hours are 10 a.m. to 5 p.m. Mondays to Saturdays; and noon to 5 p.m. Sundays. Admission is $11 for adults; $10 for senior citizens and children ages 2 to 18. Call 412-322-5058 or visit the Web site, www.pittsburghkids.org.<B>National Aviary</B>, 700 Arch St., presents the new Penguin Point. Aviary hours are from 10 a.m. to 5 p.m. Mondays through Saturdays and noon to 5 p.m. Sundays, although the museum will be closed today and Friday, as will most downtown museums, due to the G20 Summit. Admission is $10 for adults; $9 for senior citizens; $8.50 for children ages 2 to 12. Call 412-323-7235 or visit the Web site, www.aviary.org.<B>Carnegie Science Center</B>, One Allegheny Ave., North Side, as with all the Carnegie museums, will be closed today and Friday due to the G20 Summit. The center will also be closed on the following dates because of home Steelers games: Oct. 18 and 25, Nov 15, and Dec. 6, 20 and 27. Regular hours are 10 a.m. to 7 p.m. Fridays and Saturdays and from 10 a.m. to 5 p.m. Sundays through Thursdays; closed holidays. Admission is $14 for adults and $10 for senior citizens age 62 and older and children 3 to 12. Parking is $3. Call 412-237-3400 or visit the Web site, www.carnegiesciencecenter.org.