St. Jude Children's Research Hospital
The hospital was founded by actor and comedian Danny Thomas, a devout Catholic who vowed to St. Jude (the patron saint of hopeless causes) to build a hospital in his name should he ever succeed in becoming famous. When Thomas was baptized as an infant, the priest was a native of Tennessee and suggested Memphis (which is centrally located in the United States) as the location.
St. Jude is funded primarily by private donations (roughly 75%) and the rest by whatever they can collect from insurance; no patient or his/her family is ever charged by St. Jude or ever has to pay for their stay or treatment. One of its more interesting donations came from the fallout of a prize scandal; in 1995 the hospital received an anonymous donation of the winning McDonald's Monopoly grand prize game piece ($1 million); though the rules of the game prohibited transfers (and it was later discovered that the piece was part of a scheme to keep the major winning pieces among a select group of insiders), McDonald's waived the rule and made the donations ($50,000 annually with the last payment made in 2014).
As a non-profit, they are transparent about their operating costs. which are approximately $2.2 million per day. St. Jude releases their research for free, better enabling the world to treat and eventually eliminate the scourge that is childhood cancer.