Domaine de Mariemont, Castle park and heritage property in Morlanwelz-Mariemont, Belgium

The Domaine de Mariemont is a public park and arboretum at Morlanwelz, laid out in English landscape style from 1832 by Charles-Henri Petersen and later his pupils Édouard Keilig and Louis Fuchs. Its lawns, ponds and woodland hold more than 2,000 species and varieties, among them magnolias, rhododendrons, Lebanon cedars, ginkgo and giant redwoods, with statues placed along the walks. The Musée royal de Mariemont stands within the grounds.

Mary of Hungary, sister of Charles V, had a hunting pavilion built at Mariemont from 2 May 1546 on a hill above the Haine, designed by the Mons architect Jacques Du Brœucq. French troops burned it in 1554 and it was rebuilt by 1560. From 1598 Albert and Isabella turned it into a royal residence, and Louis XIV stayed there in 1670 and 1675. The château was destroyed by French revolutionary troops in 1794.

The estate's name, "Mary's mount", comes from its founder Mary of Hungary. In 1549 it hosted the "Triumph of Binche": after six days of balls and tournaments for Charles V, gentlemen disguised as savages carried four ladies off to Mariemont, and a thousand men staged a mock siege to free them before some 20,000 spectators.

The park lies in Morlanwelz, in Hainaut province, and is open to visitors together with the Musée royal de Mariemont. Paths cross lawns, ponds and woodland planted with trees from around the world, including magnolias, rhododendrons, Lebanon cedars, ginkgo and giant redwoods. Chestnuts from the estate's trees can be gathered in season.

The 1794 revolutionary troops left only ruins of the Habsburg residence; the château visitors see today was built elsewhere in the park by industrialist Nicolas Warocqué in the 19th century, then destroyed by fire in the 20th. Its successor houses the Musée royal de Mariemont, so three successive buildings occupy the estate.