Leavenworth, established in 1854, holds the distinction of being the oldest city in Kansas, predating the state's official organization and playing a significant role in its early development as a vital frontier town.

Geographically situated on the bluffs overlooking the Missouri River, Leavenworth's location historically served as a strategic point for westward expansion, trade, and military operations.

Fort Leavenworth, a key component of the city since its inception, is the oldest continuously active U.S. Army post west of the Mississippi River and a major center for military education and training, including the Command and General Staff College.

Leavenworth's early economy thrived on its role as a supply depot and transportation hub for pioneers heading west, with steamboat traffic on the Missouri River fueling significant commercial activity.

The city's population, while experiencing fluctuations throughout its history, currently hovers around 35,000 residents, representing a diverse community with strong ties to the military and local industries.

Leavenworth Federal Penitentiary, one of the oldest and largest maximum-security prisons in the United States, is a significant employer in the area and a notable landmark, housing some of the nation's most notorious criminals.

Leavenworth boasts a rich architectural heritage, with numerous Victorian-era buildings in its downtown area reflecting the city's prosperity during the late 19th century, many of which are carefully preserved.

The C.W. Parker Carousel Museum showcases the history of carousel manufacturing in Leavenworth, celebrating the legacy of Charles Wallace Parker, a prominent figure in the amusement industry.

While not a UNESCO site itself, Leavenworth’s historical significance contributes to the broader narrative of westward expansion and the development of the American West.

The city hosts various cultural events throughout the year, including the Leavenworth County Fair, celebrating agricultural traditions and community spirit.

Leavenworth's economy is currently diversified, with key sectors including government (primarily related to Fort Leavenworth and the penitentiary), manufacturing, healthcare, and retail.

The city played a role in the Bleeding Kansas era, serving as a focal point for abolitionist and pro-slavery activities, contributing to the national debate leading up to the Civil War.

Several notable individuals have connections to Leavenworth, including Buffalo Bill Cody, who resided there and had ties to the military post.

Leavenworth's connection to the military has fostered a strong sense of patriotism and community support for veterans and active-duty personnel.

The First Territorial Capitol of Kansas, although short-lived in Leavenworth, marks a significant moment in the state's early political history, symbolizing the aspirations for self-governance.