Tourists began visiting Tenerife from Spain, the United Kingdom, and northern Europe in large numbers in the 1890s. They especially were attracted to the destinations of the northern towns of Puerto de la Cruz and Santa Cruz de Tenerife. Independent shipping business, such as the Yeoward Brothers Shipping Line, helped boost the tourist industry during this time, adding to ships that carried passengers. The naturalist Alexander von Humboldt ascended the peak of Mount Teide and remarked on the beauty of the island.