The museum named after Lev Kassil, opened on November 9, 1995, is a branch of the K.A. Fedin Museum. Its collections are primarily based on the archives of L.A. Kassil and the Sobinov family. The literary and memorial exhibition reflects key moments of L. Kassil's life and work. Here, visitors can see local history materials recreating the atmosphere of provincial Pokrovsk, the writer's manuscripts, photographs, books with dedications, and personal items donated from his archive by his wife S.L. Sobinova.

The museum's exhibition occupies 144 square meters and is located in nine halls. The museum's uniqueness is defined by the personality of the writer, and it is primarily aimed at children. The bright and spectacular exhibition includes elements of play and active perception, allowing visitors to immerse themselves in the world created in the works of L.A. Kassil and witness his discoveries. The museum is interesting for both children and adults, uniting everyone who loves their hometown and Kassil's creativity.

The creation of the museum was initiated by the public of Engels. A group of intellectuals from Engels and Saratov, led by O.S. Shlangman and S.K. Nemtsov, repeatedly appealed to L. Kassil's family, the city administration, and the Moscow Writers' Union. Support was received from S. Mikhalkov, whose letter is preserved in the museum's archives.

Abram Grigorievich and Anna Iosifovna Kassil arrived in Pokrovskaya sloboda in 1904 after graduating from Kazan University. They settled on Kobzarevaya Street, where Lev Kassil was born. In 1913, the family moved to the house of merchant Ukhin, where the land of Shvambrania was created. The museum's exhibition is located in the house at 42 L. Kassil Street, where the family lived from 1918 until the mid-1950s. Lev Kassil himself lived here until 1923, when he moved to Moscow after finishing school.

Lev Kassil was attached to his hometown throughout his life. One of his first works, "The Oral Period in the City of Pokrovsk," is dedicated to this place. The story "Conduit and Shvambrania," dedicated to his childhood city and parents, brought him worldwide fame.

In the old provincial town, many creative interests of the future writer were formed. During his school years, Kassil attended classes at the Saratov Art and Practical Institute and studied with teacher A.D. Suzdalyev, who was the first to see his talent and predicted literary fame.

The museum's exhibition includes illustrations for Kassil's works by artists I. Ilyinsky, A. Yermolaev, N. Rusheva, and others, as well as enlarged photographs of Pokrovsk. The literary exhibition on the first floor is organized thematically and chronologically, while the second floor is dedicated to the memorial exhibition and works related to Pokrovsk.

The museum's collections number about 10,000 items, including rare manuscripts, documents, items belonging to L. Kassil, photographs, and books. Among the most interesting exhibits are the first publications in the magazine "New Lef," letters from K.I. Chukovsky and S.Ya. Marshak, a music box belonging to L.V. Sobinov, and a ball signed by L. Yashin.

The museum conducts thematic tours, lectures, and programs for parents with children, such as "My Imagination" and "Funny Chukokkola." Literary salons dedicated to the works of writers are popular. The museum organizes a children's carnival "Vivat, Shvambrania!" on July 10, the birthday of L.A. Kassil, involving the townspeople in the festive event.

The museum is also the initiator of social projects, such as "Keep Your City Clean!" and a children's music festival. It collaborates with public and creative organizations, including "Sinegoria" and the theater studio "We-are-not-here." Annually, at least 10 exhibitions are held in the exhibition halls, and in the future, it is planned to showcase collection exhibitions in various cities across Russia.