The collection that became the Merseyside Maritime Museum began in 1862, when Liverpool was still the second port of the British Empire and the city's Free Public Library accepted donations of objects relating to ships and the sea. For decades it grew slowly. By 1924, the entire holding was described as little more than 'an old dug-out canoe and a few model ships.' The breakthrough came in 1931 when Robert Gladstone -- maritime historian, great-nephew of Prime Minister William Gladstone, and a man with both money and connections -- created a proper shipping gallery in the Liverpool Museum. The May Blitz of 1941 partially destroyed it. Rebuilding was slow. A History of the Ship gallery opened in 1965. A Port of Liverpool gallery followed in 1971. By the late 1970s the city had committed to building a dedicated maritime museum, and the perfect site was waiting: the Albert Dock warehouses, designed by Jesse Hartley in 1846, which had stood largely disused since 1972. The new museum opened for a trial season in 1980 and fully opened in 1984, occupying Warehouse Block D and expanding into the Piermaster's House, Canning Half Tide Dock, and Canning Graving Docks in 1986.

The two great Liverpool ship disasters anchor the collection. RMS Titanic was a White Star liner — and the White Star Line was Liverpool's. Although she sailed from Southampton on her doomed maiden voyage in April 1912, her registry was Liverpool and her crew, almost without exception, were Liverpudlians and Mersey men. Of the 685 crew members who died when she struck the iceberg, 549 had Liverpool addresses. In 2012, on the centenary of the sinking, the museum exhibited rare artefacts: a deck chair from the ship, recovered logbooks from rescue vessel Carpathia, letters from passengers and crew. RMS Lusitania was Cunard's flagship, also Liverpool-registered, and on 7 May 1915 she was torpedoed by U-20 off the Old Head of Kinsale on her return voyage from New York. She sank in eighteen minutes. Of 1,962 people aboard, 1,198 died, including 128 Americans — a death toll that helped shift American opinion toward joining the First World War. The museum holds her ship's bell, recovered fittings, and the records of the men who built her in Glasgow but called Liverpool home.

Between 1830 and 1930, an estimated nine million people emigrated through the Port of Liverpool. They came from every part of the British Isles, from Ireland especially in the Famine years, from Scandinavia, from Russia and Eastern Europe, from the German states. They came by train and by coastal steamer to the Liverpool dockside, slept in lodging houses around the Pier Head, and queued at the offices of the Cunard, White Star, and Inman lines. They were processed, ticketed, medically examined, and sent down gangways onto ships bound for North America, Australia, South Africa, and South America. The Maritime Museum's emigration galleries reconstruct what that crossing meant — the steerage decks, the bunks stacked three high, the rations, the long week or twelve days at sea before landfall at Ellis Island or Quebec or Sydney. For most of those emigrants, Liverpool was the last European city they ever saw. For a great many, it was also the first city they ever lived in, having come from villages where the largest building was the church. The galleries try to honour both ends of that journey — the lives left behind and the lives the emigrants made elsewhere.

On the top floor of Warehouse D sits the International Slavery Museum, opened in 2007 as part of the same complex. It exists because Liverpool cannot tell its maritime story without telling the truth about how the port made its first fortune. Between roughly 1700 and 1807, Liverpool ships carried an estimated 1.5 million enslaved Africans across the Middle Passage to the Americas. At the trade's peak in the 1790s, Liverpool was responsible for more than 80 percent of the British slaving voyages and approximately 40 percent of the entire European slave trade. The fortunes built from this commerce financed many of the warehouses, dock works, and grand commercial buildings that still define central Liverpool. The Slavery Museum confronts this history with archaeological artefacts from West Africa, replicas of slave-ship holds, oral histories from the African diaspora, and material on contemporary anti-slavery movements and racial inequality. It is the first museum in Europe to address the transatlantic slave trade specifically and at length, and is now an institution in its own right. Both it and the Maritime Museum closed in January 2025 for major renovation works expected to last until 2028.

Walking up to the museum, take a moment to look at the building. The Albert Dock complex was the most ambitious dock project of mid-Victorian Liverpool, designed by Jesse Hartley and Philip Hardwick and opened in 1846 by Prince Albert himself. The warehouses are unique in the world's industrial architecture: cast-iron columns supporting brick-and-stone walls, fireproof construction throughout, gigantic interior spaces directly accessible from the quayside so that cargo could be unloaded from ship to warehouse without ever touching the dock. Hartley designed five warehouse blocks; only blocks D and E survive in full. They were Grade I listed in 1952. The dock itself was the first non-combustible structure in Britain and the first to be enclosed completely by warehouses on all four sides. After commercial closure in 1972 and a long period of dereliction, the regeneration of Albert Dock in the 1980s -- including the museum -- launched the rebirth of Liverpool's waterfront. The Tate Liverpool moved into Warehouse C in 1988. The Beatles Story occupies another block. The waterfront they all share is now a UNESCO World Heritage Site, though Liverpool lost that status in 2021 after disputes over modern development.