The Tunnels of Oldebrooke

Oldebrooke itself is an old town, that has not been inhabited for over at least 500 years. It is situated a little to the east of the Nell, and lies between Basilford and Nellmouth on the North-South axis. The village is spread out over the hills in the area and the valley between them. From the river, some of the hillside buildings can be spotted.
The town is named after the small body of water that runs through it towards the Nell. In Oldebrooke, there is one visible entrance to a network of tunnels running underneath the village. From the surface, the other entrances are well hidden, though there is an entrance near almost every location in the village. The big differences in altitude between the homes leads to sharp inclines and declines in several places, making the tunnels hard to traverse for anyone. The tunnels branch outwards into the more rural area, and the longest runs all the way to Basilford.
The tunnels are slightly over a meter in height, making it almost comfortable for small creatures to navigate through, though they are traversible by medium creatures too, though not while standing upright.
The village above primarily contains traces of homes more suitable to small creatures, most of which are in a style most related to gnome communities living in the north of the country. However, some homes of medium sized creatures have also been found, whose style and origins have not yet been traced.
It is uncertain why a small town such as Oldbrooke was so well protected. It therefore is a destination for anthropologists and tourists alike. There are even some guided tours taking travelers into a relatively spacious part of the tunnels, letting them explore a few metres of it, while telling some of the most common ghost stories related to the area. These tours start at the visible entrance of the tunnels at the foot of one of the hills, and end only a little further at one of the nearest exits. Tour guides are most vigilant about their visitors not wandering off, as it would not be the first time for a teen to emerge from the tunnels three days later, lost and in severe state of dehydration.