Close by a little place called Pfaeffikon in the Canton of Zuerich in northern Switzerland, stands on a hill the Roman castle known today under the name 'Irgenhausen'.
Not much is really known about these fortifications. For one, its Latin name remains unknown. It was excavated in the 19th century. Further to its excavation it was partially restored, giving it its current shape.
The castle appears to have been built during the reign of Diocletian to help secure the road from Vitudurum (Winterthur) to Curia (Chur).
Also present are some remains from a country estate, villa rustica, within the castle itself.
The information provided on site is slightly confusing. The villa is described as having been there before the castle, yet at the same time is defined as having been built in the 4th century AD.
Generally, a very fine site. Atop a gentle hill, several large trees growing within its centre, the Irgenhausen castle is sometimes used by scouting groups, who camp out there.
A red line (only faintly visible on the scanned image) marks the ancient from the restored. Hence it can easily be seen that most of today's structure was added by the excavators to give an impression of what this stronghold might have looked like.
A glance across the walls and towers to the east give a good impression of the views enjoyed by the Roman soldiers surveying the area for any dangers.
And here are the stones indicating the position of the 'villa rustica', which once stood here (most likely before the erectino of the fort would be my personal guess).
Irgenhausen was not so much a large army camp, as seen on the pictures of Vindolanda, but a small fortification from where its garrison could dominate the surrounding area.
Narrow gaps in the sides of the remains have evidently been interpreted as arrow slits by those who restored the walls. All in all, the walls are thick and impressive, the gateway being flanked by sturdy towers.