Pratt St., Baltimore, MD 21202 [Read: The Best Tourist Attraction ... of business and first opened to the public in 1922. The must-see caverns boast impressive rock formations and are worth ...

Baltimore, Maryland is a fun city with beautiful water views and a top-rate aquarium. And located just an hour by car, and less by train, from Washington DC, Baltimore makes for the perfect day trip.

Still, most reviewers called the attraction a must-do in Baltimore. The aquarium is conveniently located on the Inner Harbor, and is easily accessible with the free Charm City Circulator.