The pillbox sits on two acres of green belt land
A World War II guard post hidden away in Cambridgeshire woodlands has been put up for sale.
It has no central heating or windows, and the front door is only 3ft (36in) but the property, which comes with two acres of woodland, could fetch £20,000.
The 60-year-old pillbox, near Great Shelford, was used as a vantage point for soldiers to keep watch over Cambridge in case of enemy attack.
Auctioneers Cheffins said more than 60 people had already shown an interest.
The bunker and surrounding land was put on the market by a man from Kent, who inherited it from his grandfather.
Pillboxes were dug-in guard posts, often camouflaged to hide their locations.
Cheffins director Simon Gooderham said: "What is actually up for sale is a small piece of woodland, about two-and-a-quarter acres, which not only has the pillbox on it, but an old railway carriage converted into a shed, and a former chalk pit.
"It's not a piece of land that can be developed. It's in the greenbelt, so building is not allowed.
"But for people who love the outdoors, and who want to have somewhere of their own in the countryside that they can walk through and where they can enjoy nature, it's a lovely spot."
The land used to be a council depot, but was sold on privately years ago.