Nyborg castle has been a favourite residence of the Danish Kings. After the Swedish Wars in the 1650s, it was extended into a fortress with a system of embankments and large bastions, the remnants of which can still be seen. On the Queen's Bastion there are four 18-pound model 1753 cannons, and two 84-pound system 1934 heavy grenade cannons, made according to original drawings from the Royal Danish Arsenal Museum.
It was not possible to dig wells in Nyborg, so water had to be brought in from outside when the town grew up around the fortress som 800 years ago. From the pretty stone bridge built on Ladegårdsvej in 1834, you can see Ladegårds Å river, running through the bottom of a narrow tunnel vally formed during the Ice Age. Many years ago, the water from Vindinge Å river was diverted so it ran to Nyborg via Ladegårds Å river. This provided the town with drinking water, water for the castle mill and water to fill the moats around the fortress. The mouth of Ladegårds Å river, which opened into the fjord, was blocked by a low dam, forming Ladegårds Sø Lake, which abutted the fortress.
Walking westwards along the Ladegårds Å river path, you will come to Hjulby Sø lake and moor.
On the south side of Ladegård Sø lake are the remains of Ladegårdsskoven wood, which was once the castle's deer park. The remaining old oak trees are all protected.
If you walk from Nyborg castle through the gate under the ramparts, you have the wide moat, Kamgraven, in front of you. On the opposite bank, the water flows in from Ladegårds Sø lake. A channel leads the water on under the gates into Slotssøen (castle lake).
If you go back through the gate and along the path towards Torvet (the town square), you will see the waters of the lake flow under the bridge alon slotsgraven to the library peninsula and the in the opposite direction in Møllegraven, along Slotsgade, past Torvet and in through Slotsmøllen. The town's drinking water used to be led from Møllegraven, via channels made of hollowed tree trunks, to basins where it could be pumped up by the citizens of the town.