Augustinian Church was originally built in 1327 as the parish church of the imperial court of the Habsburgs. In 1634, the Augustinerkirche became the parish church of the imperial church. As imperial church, many Habsburg weddings took place there, including the wedding of Archduchess (and future Empress) Maria Theresa in 1736 to Duke Francis of Lorraine, the wedding of Archduchess Marie Louise in 1810 to Emperor Napoleon Bonaparte of France, and the wedding of Emperor Franz Joseph in 1854 to Duchess Elisabeth in Bavaria.
The nave was built under architect Dietrich Landtner from 1330 to 1339, but not consecrated until 1 November 1349. As the nearby Hofburg expanded, the Augustinerkirche gradually became engulfed by it and today is a part of the complex. Although inconspicuous from the outside, the inside is more ornate. During the reign of Emperor Joseph II, 18 side altars were removed in 1784 when the church was restored in the gothic style. A new side altar was added in 2004, dedicated to Emperor Karl I of Austria (1887–1922) who is on the path to being recognized as a saint by the Roman Catholic Church.
The Loreto Chapel, to the right of the main altar, holds the silver urns containing the hearts of Habsburg rulers, while their bodies are kept in the Imperial Crypt. Herzgruft contains the hearts of 54 members of the imperial family.
Notable among the church's monuments is the memorial to Archduchess Maria Christina of Austria sculpted by Antonio Canova, in 1805.
References:Kakesbeck is one of the largest medieval fortifications in Münsterland and the oldest castle in Lüdinghausen. The imposingly grown complex originated in 1120 as a motte, a small hilltop tower castle. After numerous changes of ownership, the castle was extended onto two islands, but it was not until the 14th century that it underwent significant alterations and extensions under the von Oer family. The estate experienced its heyday in the middle of the 18th century, when it covered an area of almost one square kilometre and consisted of five further outer castles in addition to the core castle, which were secured by ramparts and moats.
The well-maintained condition of the castle today is thanks to the late Wilfried Grewing, the former lord of the castle. The foundation named after him has been particularly committed to preserving the property since 2020.