Kostanjevica Monastery, Franciscan monastery on a hill in Nova Gorica, Slovenia

Kostanjevica Monastery is a Franciscan monastery set on a hill between Nova Gorica and Pristava in Slovenia. The complex features stone buildings with a church containing a crypt beneath the altar and houses a library with a substantial collection of older books.

The site was established in 1623 as a Carmelite sanctuary but came under Franciscan control after Emperor Joseph II dissolved the religious orders in 1781. The monks took over the grounds in the early 19th century.

Locals call the monastery Kapela. The library, named after Slovene linguist Stanislav Škrabec, who lived here over 40 years, holds texts from the 16th to 19th centuries, including Adam Bohorič's first Slovene grammar with the author's dedication. A rose garden opened in 2004 above the crypt.

The monastery sits on a hilltop and is accessible on foot, though the path offers little shade on the way up. The cooler months are best for visiting, and sturdy shoes are recommended.

Charles X did not die at the monastery: he died in Gorizia in 1836, and his remains were later placed in the crypt, where six members of the French Bourbon line lie, among them the Count of Chambord (Henri V) and the Duke of Blacas, a courtier of the king. The crypt also holds Maria Theresa of Austria-Este.