Baltimore Aquarium Parking can be difficult but not impossible with these tips! The National Aquarium is the largest tourist attraction in Maryland, and for good reason! It has over 17,000 specimens and over 1.5 million people visit each year. The best parking we found was at the Harbor Park Garage at 55 Market Place. You can reserve a spot online if you are members of the Aquarium and also if you are NOT members! The website to reserve is: https://harborparkgarage.com/parking-nearby/Baltimore-national-aquarium-parking-referral/ It is currently $18 for all day and located just 3 blocks from the Aquarium.