Maridon Museum, 322 N. McKean St., is open from 11 a.m. to 4 p.m. Wednesdays through Saturdays, except holidays, Museum admission is $4 for adults, $3 for senior citizens and students, and free for children younger than 8 accompanied by an adult. Guided tours are available with advanced notice for no extra charge. Call 724-282-0123 or visit www.maridon.org.

Carnegie Science Center on the North Side has a Locomotion Weekend on Saturday and Sunday. Hours will be from 10 a.m. to 5 p.m. when guests can explore a rail yard full of guest train displays owned and operated by local hobbyists, take their own trains for a free checkup, and see the Miniature Railroad & Village layout. Locomotion Weekend activities are included with general admission of $19.95 for adults, $14.95 for senior citizens and $11.95 for children; those younger than 2 are admitted free. Visit carnegiesciencecenter.org or call 412-237-3400.