The Camden Rat Hole is a service tunnel, forming part of the London Underground and was used as an empty carriage line.
A former Victorian water works laid out in the form of a water garden. The water from Swithland Reservoir was originally cleaned here and served the population of Leicester.
A disused mine in Wales, with a huge pile of motor vehicles that have been dumped through a small opening, making an amazing reflection in the underground lake below.
St John’s Asylum in Bracebridge Heath was a mental asylum built in 1852. The grand Italian style building is now a shell of its former greatness.