Philadelphia Zoo, America’s first zoo, is offering locals and tourists to the region the chance to visit the Zoo at its best prices of the year to celebrate America 250 and the Zoo’s 153rd grand opening anniversary. For just five days, guests can enjoy 25% off all general admission tickets on Wednesday, July 1 through Sunday, July 5 with code 4JULY25. Ticket prices vary from $21-29.50 for adults and $17-24 for children. The sale starts Saturday, June 27.