Plaques on the ground in Budapest and marking the line of fortresses, camps and stations of the Roman army along the Danube (Pannonian Limes)
The current plaque shows Ad Statuas, the Roman name of the fort (Castra) in Ács-Vaspuszta, Hungary
This board is adjacent to another board and above it you can see the route of the Danube River Click for a larger image
See the lid attached to this lid
In the next photo taken on the same day, part of the line of fortresses was seen, with the route of the Danube River between the various plates Click for a larger image