One of Alaskaʼs pioneering expedition ships, National Geographic Sea Lion was built in 1982 and carries just 62 passengers. The ship, which was refitted by Lindblad Expeditions in 2015 and is the twin of National Geographic Sea Bird, has three passenger decks and is small enough to call at remote coves in a range of places, from Alaska to Costa Rica, and can even traverse inland waterways such as the Columbia and Snake rivers.