in the United States, including HDR, Inc., DLR Group, Inc., and Leo A Daly. Top employers According to the Greater Omaha Economic Development Partnership, the largest regional employers are: Tourism Tourist attractions in Omaha include history, sports, outdoors and cultural experiences. Its principal tourist attractions are the Henry Doorly Zoo and the College World Series. The Old Market in Downtown Omaha is another major attraction and is important to the city's retail economy. The city has been a tourist destination for many years. Famous early visitors included British author Rudyard Kipling and General George Crook. In 1883 Omaha hosted the first official performance of the Buffalo Bill's Wild West Show for 8,000 attendees. In 1898 the city hosted more than 1 million visitors from across the United States at the Trans-Mississippi and International Exposition, a world's fair that lasted for more than half the year. Research on leisure and hospitality situates Omaha in the same tier for tourists as the neighboring cities of Des Moines, Iowa; Topeka, Kansas; Kansas City, Missouri; Oklahoma City, Oklahoma; Denver, Colorado; and Sioux Falls, South Dakota. A recent study found investment of $1 million in cultural tourism generated approximately $83,000 in state and local taxes, and provided support for hundreds of jobs for the metropolitan area, which in turn led to additional tax revenue for government. Arts and culture Several national newspapers, including the Boston Globe and The New York Times have lauded Omaha's historical and cultural attractions. The city is home to the Omaha Community Playhouse, the largest community theater in the United States. The Omaha Symphony Orchestra and its modern Holland Performing Arts Center, the Opera Omaha at the Orpheum theater, the Blue Barn Theatre, American Midwest Ballet, and The Rose Theater form the backbone of Omaha's performing arts community. Opened in 1931, the Joslyn Art Museum has large art collections. Since its inception in 1976, Omaha Children's Museum has been a place where children can challenge themselves, discover how the world works and learn through play. The Bemis Center for Contemporary Arts, one of the nation's premier urban artist colonies, was founded in Omaha in 1981, and the Durham Museum is accredited with the Smithsonian Institution for traveling exhibits. The city is also home to the largest singly funded mural in the nation, "Fertile Ground", by Meg Saligman. The annual Omaha Blues, Jazz, & Gospel Festival celebrates local music along with the