These are the abandoned buildings that have been left to ruin and are now completely overgrown as nature creeps in to reclaim them.
Windowsills, sinks and entire rooms are becoming home to plants now the human inhabitants have moved out.
And it is only a few chairs, mirrors and cabinets that give clues that people once called these places home.
But Mother Nature has long since erased all trace of humans from the buildings, which are scattered across Europe.
Thomas Windisch, an Austrian student from Graz, travelled to the UK, Italy, Croatia, Belgium, and Germany to take the pictures.
The 33-year-old said: 'The idea was to show how Mother Nature turns dead buildings into living places again.
'No matter what the building is made of, nature always finds a way in. As soon as the roof is gone, seeds and water do their work and ivy breaches through every crack and broken window.
'The ceiling shots are my favourites because they look a bit surreal. So do the overgrown greenhouses and the wash basin in front of the brick wall.
'They are all different places, a selection of hospitals, villas, greenhouses or industrial sites.
'I started exploring places like these a few years ago. I always liked to travel around and discover new things.
'Many of them are simply breathtaking. The special mood of the light and the minute details make these places very special to me.'