During the 1800s, ocean liners were used mainly to carry cargo or mail overseas. But in the latter part of the century, immigrants from Europe began to fill the enormous ships during their westward voyages as the liners headed (primarily) to America and Canada. As the ships grew in popularity among wealthier travelers, ocean liner companies battled one another to provide the most space, the most amenities, and the most comfort during the transatlantic crossings. By the early 1900s, the Golden Age of liners was in full swing, and would last through the Second World War. Pictured: the Lusitania, the largest liner to grace the ocean in 1907.