Of which, Mill Ends Park in Portland, USA is famous?
covers an area of approximately 0.29 m²
is located on the roof of a skyscraper
he is inhabited by a grizzly bear
Mill Ends Park is a small circle 2 ft (0.61 m) across, with a total area of 452 sq in (0.292 m2). It is the smallest park in the world, according to the Guinness Book of Records, which first granted it this recognition in 1971. The park was dedicated on St. Patrick's Day, 1976, as "the only leprechaun colony west of Ireland," according to Fagan.