If you visit independence hall, there is a 50% off coupon on the back of the map which is distributed at the visitor center. You could also buy a Philly historic district pass, cost is $18, which includes admission to betsy ross house, christ church burial ground, admission into the national constitution center and 2 all day passes to ride the Philly phlash bus.
$14.50 adults $11 kids(6-18yrs old)
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