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During the Baroque period, French garden design had a strong influence on Danish castle gardens. We are not aware of any companies which offer specialist tours of Danish gardens - but no garden enthusiasts should visit Copenhagen without visiting the waterfront where the Little Mermaid rests (there is a baroque fountain nearby). They should also visit the Tivoli Gardens, which are full of flowers, fountains and restaurants. The art gallery at Louisiana, north of Copenhagen, is also an attraction..
See list of gardens to visit in Denmark