When Prince Ludwig of Sayn-Wittgenstein-Sayn had the castle Sayn, which he had acquired, remodeled in the neo-Gothic style in the mid-19th century, a park in the English landscape style was simultaneously created on an area of approximately seven hectares in front of the castle. Based on a design by the former director of the Botanical Garden in St. Petersburg, Karl-Friedrich Thelemann, it was implemented by the garden artist Heinrich Siesmayer and was meant to form a romantic ensemble together with the castle and the two-hectare Burgberg. Rare trees, the castle pond with a fountain, the lion grotto, a Marian chapel, a cloister with cast-iron stations, as well as the streams of Sayn and Brex characterize the site. Today, the Butterfly Garden created by Princess Gabriela in 1987 is the main attraction of the park.