Mining left many tailings piles (small hills of ground rock), which are considered unsightly locally. Contiguous walls are constructed with small gaps between adjacent piles. Most laboratory strains were taken from artificial environments such as gardens and compost piles. Tunnel entrances can be identified by small piles of loose soil covering the opening. Fort frequented the parks near the Bronx, where he would sift through piles of clippings. They often lived alone in small huts to tend their wood piles. Together with the boulder piles and Skull Rock, the trees make the landscape otherworldly. Building foundations rested on plates of Istrian limestone placed on top of the piles.. Some of the rock piles they built are still there. Like all rhinos, the Indian rhinoceros often defecates near other large dung piles. It is supported by 5,238 concrete piles. As the gold piles up, fear and suspicion take hold of each man. The dung is laid in well-defined piles. Private citizens added their own piles of unwanted papyri. The trunks have been used as wharf piles.