One certificate for a basic membership at The Maryland Zoo in Baltimore. Basic membership allows two adults and four children under the age of twenty-one (21) unlimited admission to The Maryland Zoo PLUS discounted admission to over 150 Zoos nationwide for one year. To redeem your membership, please return this form to The Maryland Zoo Membership Department, 1876 Mansion House Drive, Druid Hill Park, Baltimore, Maryland, 21217, or bring the form directly to the Zoo and present it to the Member Services Center. Your membership is valid from one year from the redemptions date and must be redeemed by 06-30-2017.