Part of the Oceanographic Teaching Stations nonprofit organization, this small aquarium features rotating exhibits, as well as a shark tank, a tide pool touch tank and a living reef tank. Classes and events are held regularly to encourage the public to take an interest in the ocean and coastline of Southern California, including the impact of the human population on the environment. Donations are suggested for admission at the Roundhouse Marine Lab & Aquarium, which is located off Manhattan Beach Boulevard, at the end of the Manhattan Beach Pier.
The Lock House, located along the Susquehanna River in historic downtown Havre de Grace, was built in 1840 and remained in service until the canal stopped being used in 1900. In 1982 the Lock House was transformed into a museum and opened to the public and renamed the Susquehanna Museum at the Lock House. Enter the museum and tour the Lock Keeper's bedroom, the Havre de Grace room which provides detailed history of the town and the War of 1812 room which hosts maps of the area.