Most of the lime kilns are gone now. Old maps from the 19th Century suggest they were once dotted all around the farms run by Shane McAuliffe, a pig farmer in Ireland.
In the Altai Mountains of western Mongolia, travellers sometimes stumble on stone cairns topped with horse skulls and sticks flying coloured prayer flags. People have clearly put these installations there on purpose.
In the city of Milan, Italy, two tower blocks garlanded with greenery rise from their surroundings. The architect that designed these buildings, Boeri Studio, christened them Bosco Verticale, or “vertical forest” – a demonstration of how urban structures could be so much greener than we’re used to.