Helsinki is also home to numerous Art Nouveau-influenced (Jugend in Finnish) buildings belonging to the Kansallisromantiikka (romantic nationalism) trend, designed in the early 20th century and strongly influenced by ''Kalevala'', which was a common theme of the era. Helsinki's Art Nouveau style is also featured in central residential districts, such as Katajanokka and Ullanlinna. An important architect of the Finnish Art Nouveau style was Eliel Saarinen, whose architectural masterpiece was the Helsinki Central Station. Opposite the Bank of Finland building is the Renaissance Revivalish the House of the Estates (1891).