Patee House & Pony Express Museum

Built in 1858 as a luxury hotel, Patee House served as the Pony Express headquarters from 1860 to 1861. During the Civil War, the Union Army occupied the building, using it as their Provost Marshal's office and holding war trials in the ballroom. It is one block away from the home of infamous outlaw Jesse James, where he was shot and killed by Bob Ford. After his death, the James family stayed and were interviewed in the hotel. (Quoted from their website).
At one time, it was one of the best-known hotels west of the Mississippi, and had the moniker "The World's Hotel".
The first collection of pics relates to the Pony Express, while the latter set focuses more on the Hotel part.