Omaha is the largest city in the state of Nebraska. It is located in the Midwestern United States on the Missouri River, about 20 miles (30 km) north of the mouth of the Platte River. The city was founded along the Missouri River and a crossing called Lone Tree Ferry earned the city its nickname, the "Gateway to the West."
The city is the home to five Fortune 500 companies: ConAgra Foods, Union Pacific Corporation, First Data, Peter Kiewit and Sons, Inc., Mutual of Omaha Companies, and Berkshire Hathaway, the company headed by legendary investor and so-called Oracle of Omaha, Warren Buffett, who was the richest person in the world according to Forbes Magazine in 2008. The Gallup Organization, TD Ameritrade, PayPal and LinkedIn all have major operations or headquarters in Omaha. The city also is home to three of the top 30 architectural and engineering firms in the world: Leo A. Daly Co.; HDR, Inc.; and DLR Group.
Tourism in Omaha benefits the city's economy greatly, with the annual College World Series providing important revenue and the city's Henry Doorly Zoo serving as the top attraction in Nebraska.
The Old Market located in downtown Omaha has many restaurants, art galleries, and upscale shops. The area retains its brick paved streets from the turn of the century, horse-drawn carriages, and covered sidewalks in some areas. It is not uncommon to see a variety of street performers, artists, and other vendors.