Klaipėda was originally called Memel by local Baltic tribes. Klaipėda Castle was built in 1253 on the left bank of the estuary connecting the lagoon to the Baltic Sea in a strategically important location. It was rebuilt many times until losing importance in the 19th century and being demolished. Klaipėda now has international ferry terminals and a cruise ship terminal launched in 2003 that can accommodate ships up to 315 meters long. The city holds an annual Sea Festival celebrating its maritime heritage, traditionally the last weekend in July, which began in 1934. Klaipėda also has a dolphinarium, which is an aquarium for dolphins that are usually