A collapsed tunnel on the site of a former coal mine. The purpose of this tunnel is a mystery but a nice wooden and steel door remains.
Not sure what this tunnel was, it lies underneath an old coal mine, so could have been an ventilation tunnel.
Tunnel, built in the first half of the 19th century to allow shallow barges with coal to be transported. The walkway next …
We explored these tunnels carrying a small river under a small town. The variety of shapes, materials and sizes was amazing.
It’s a glorious one
A 19th century brick fort, once protecting on of the large cities in Belgium, now home to bats and birds.