Rosenborg Castle is a renaissance castle in Copenhagen, Denmark built as a country summerhouse in 1606. The Rosenborg Castle Garden is the country's oldest royal garden and was embellished in the Renaissance style by Christian IV shortly before the construction of the main castle. Today, the gardens are a popular retreat for the people of Copenhagen, and attract an estimated 2.5 million visitors every year. Take a relaxing visit as you piece together the castle and its beautiful blooms.