Quarry Farm is located in Elmira, New York. In 1869, Jervis Langdon purchased it as a vacation home for his family. When he died the following year, it was inherited by his eldest daughter, Susan Langdon Crane, Mark Twain's sister-in-law. 

Twain and his family summered there for over twenty years. He wrote much of his work in an octagonal study built expressly for him about 200 yards (180 m) from the main house in 1874.  

The study has since been moved to the Elmira College Old Campus in order to protect it from vandalism. The home is not open to the public.  http://en.wikipedia.org/wiki/Quarry_Farm  

Mark Twain was at Quarry Farm from May 27, 1895 until July 14th, 1895 when he, Livy and Clara departed for Cleveland, OH on the Following the Equator tour. (MTDBD)