Sculpture and photographer Andy Goldsworthy (British, b.1956) has spent the last several decades creating transitory, site-specific installations around the English and Scottish countryside. Using largely found materials, he builds his works on-site, allowing them to  form organically and intuitively.

His works are intentionally temporary and he views the inherent decay as a part of the work itself. See more of his works below and read a great interview with the artist over at NPR.