The home of carnival, steel bands, calypso and limbo dancing, Trinidad & Tobago's blend of different cultures gives them an air of cosmopolitan excitement. Port of Spain, surrounded by the lush green hills of the Northern Range, is the capital and business hub of oil-rich Trinidad. The city captures the variety of Trinidadian life, with bazaars thronging beneath modern skyscrapers and mosques rubbing shoulders with cathedrals. The architecture of the city incorporates a mixture of styles: these include Victorian houses with gingerbread fretwork; the German Renaissance Queen's Royal College; Stollmeyer's Castle, an imitation of a Bavarian Castle; the President of the Republic's residence and the Prime Minister's office at Whitehall (both built in Moorish style); and the 19th-century Gothic Holy Trinity Cathedral. Places of interest include the shopping district centered on Frederick Street; the Royal Botanic Gardens; the Red House (a stately colonial building, now the seat of government) and the National Museum and Art Gallery.