Today, Aquileia is a town smaller than the colony first founded by Rome. Over the centuries, sieges, earthquakes, floods, and pillaging of the ancient buildings for materials means that no edifices of the Roman period remain above ground. The site of Aquileia, believed to be the largest Roman city yet to be excavated, is inscribed on the UNESCO World Heritage List.
Excavations, however, have revealed some of the layout of the Roman town such as a segment of a street, the north-west angle of the town walls, the river port, and the former locations of baths, of an amphitheater, of a Circus, of a cemetery, of the Via Sacra, of the forum, and of a market. The National Archaeological Museum contains over 2,000 inscriptions, statues and other antiquities, mosaics, as well as glasses of local production and a numismatics collection.
The most striking remains of the Roman city are those of the port installations, a long row of warehouses and quays that stretch along the bank of the river. These were incorporated into the 4th century defences, substantial traces of which can be seen today.
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.