Fort Churchill is a Nevada State Park. They have a website, so there is no need for me to go into great detail on the history. Link below. I do believe that when we were there last, we had to pay a fee to go inside and see it. There is also a cemetery located there. Once upon a time, there were several soldiers buried here. They were removed from this ground and taken to Lone Mountain Cemetery in Carson City in 1885. Graves for members of the Buckland family still remain. That cemetery is linked in the Old Cemeteries section of this website.
The following is the opening paragraph from the Nevada State Park website for Fort Churchill:
"An integral part of the history of Nevada and the American West, Fort Churchill was built in 1861 to provide protection for early settlers and guard Pony Express mail runs. Today the ruins are preserved in a state of arrested decay within the Fort Churchill State Historic Park, and visitors can walk designated trails to study the ruins. The park also features the renovated Buckland Station, an important way station in the 1800s for pioneer travelers on the Overland Route. With 3,200 acres along the Carson River, the park is an idyllic place for campers, hikers, bird watchers, canoeists and equestrians."