Deadwood, South Dakota circa 19th century
Deadwood was a city located in South Dakota on Earth.
With the help of Reginald Barclay, Alexander Rozhenko designed a recreational holoprogram in 2369, which depicted Earth's 19th century "the Ancient West" or better known as the "Wild West".
The program allowed participants to play the town sheriff, his deputy, and Durango, a mysterious stranger. The setting consisted of an old western town with the Gold Strike Saloon, Miss Langford's House of Pleasure, a sheriff's office, and other buildings which were from that period. The objective of the program was to apprehend Eli Hollander, "the Butcher of Bozeman", a known criminal wanted for murder.
Deanna Troi, Worf and Alexander were running this program when a experiment which Geordi La Forge and Data were conducting went wrong and influenced the program, giving the main characters Data's physical characteristics and removing the holodeck safeguards, making the 19th century firearms deadly. (TNG: "A Fistful of Datas")