query: When was Blenheim Palace built?
passage: Blenheim Palace
BlenheimPalace (pronounced /ˈblɛnɪm/ BLEN-im[1]) is a monumental country house in Blenheim, Oxfordshire, England. It is the principal residence of the Dukes of Marlborough, and the only non-royal, non-episcopal country house in England to hold the title of palace. The palace, one of England's largest houses, was built between 1705 and 1722, and designated a UNESCO World Heritage Site in 1987.[2]
passage: Blenheim Palace
The Long Library organ was built in 1891 by the famous London firm of Henry Willis & Sons at a cost of £3,669.[34] It replaced a previous organ built in 1888 by Isaac Abbott of Leeds, which was removed to St Swithun's church, Hither Green.[35] Originally erected in the central bay, with its back to the water terraces, the Norwich firm of Norman & Beard moved it to the northwestern end of the library in 1902 and made a few tonal additions and, the following year, cleaned it.[34] No further changes were made until 1930, when the Willis firm lowered the pitch to modern concert pitch: a Welte automatic player was added in 1931, with 70 rolls cut by Marcel Dupré, Joseph Bonnet, Alfred Hollins, Edwin Lemare and Harry Goss-Custard also being supplied.[34] This remained in use for some time: the Duke of the time is said to have frequently sat at the organ bench and pretended to play the organ to his guests and they would applaud at the end. This practice is said to have been halted abruptly when the player started before the Duke had reached the organ. This famous instrument is regularly maintained and is played by visiting organists throughout the year, but its condition is declining: a fundraising campaign has been launched for its complete restoration.[36]