is there any literature about the raimondi chapel?
For a general summary I suggest Stokstad’s Art History, Volume II; however, because the Raimondi Chapel is inside of the San Pietro church, I suggest books that encompass Bernini’s work such as: Bernini: The Sculpture of Roman Baroque, Bernini: Art as Theater, etc. It might take some work, but there’s bound to be a book about Bernini that details the Raimondi Chapel in depth.
where is the original painting of the beach by thomas hart benton
One can search Google to find out more information about the painting. Off hand, I do not know the location of On The Beach - it may be in a museum or in a private collection. The Nelson-Atkins Museum of Art has a collection of Benton’s work - On The Beach might be included so I would suggest searching the museum’s online collection. The following books may also have information about the painting’s current location: Thomas Hart Benton and the American South by J. Gruber and Thomas Hart Benton: An Artist in America.