The exploration of man-made structures, usually abandoned ruins or not usually seen components of the man-made environment.
Dark Roasted Blend: Epic Abandoned Substations and Power Plants
The Old Rissik Street Post Office - Johannesburg, South Africa.
Jeppe Street from Anstey's Building.
Going Postal: 12 Stamped Out & Abandoned Post Offices
Old Deco building, Hillbrow, JHB, Sa
Abandoned building in Johannesburg.
Abandoned building in Joburg 2 more on the link http://affricanalien.com/inside-an-abandoned-building-in-joburg/
Beware of Colour: Activists Highlight Decay with Pink Paint