The University Botanical Gardens are a park within a park — an area of leafy trees, small footpaths and beautiful flowers and bushes. It is also the home of Finland's greatest botanical collection. The gardens came to Helsinki when the university changed locations after the great fire of Turku. The gorgeous greenhouses have been restored several times over the years, most extensively after the 1944 air raids. The gardens, designed by St. Petersburg architect Franz Falderman in the 1830s, are best known for their gorgeous C. L. Engel—designed main greenhouse, the central dome of which looms elegantly on the Kaisaniemi horizon. It is home to numerous tropical plants (cacti, orchids, royal water lily, cocoa), whereas the outdoor plants are from more temperate climates. The garden's main entrance is on Kaisaniemenranta, a boulevard that follows Kaisaniemi Bay, which is lined with old Empire—style wooden houses.