Underground Atlanta is a shopping and entertainment district in the Five Points neighborhood of downtown Atlanta, Georgia, United States, near the intersection of the east and west MARTA rail lines. First opened in 1969, it takes advantage of the viaducts built over the city's many railroad tracks to accommodate later automobile traffic. Each level has two main halls, still called Upper and Lower Alabama and Pryor Streets.

The buildings were constructed during Atlanta's post-Civil War Reconstruction Era boom, between 1866 and 1871, when the city's population doubled from 11,000 to 22,000 residents. In 1869, the Georgia Railroad freight depot was constructed to replace the one destroyed by Sherman's troops in 1864. The depot, which stands at the entrance of Underground Atlanta, remains the oldest building in downtown Atlanta. However, the depot was originally three stories tall but the second and third story were destroyed by fire. Besides the train station, the bustling district included hotels, banks, law offices, and saloons. An electric streetcar was installed in 1889 to points South, and by 1900 the depot was serving 100 trains per day with direct service between Atlanta and New York City; Cincinnati, Ohio; Chattanooga, Tennessee; Knoxville, Augusta, Georgia; Macon, Georgia; and Columbus, Georgia.

Atlanta ( /ətˈlæntə/, stressed /ætˈlæntə/, locally  /ætˈlænə/) is the capital and the most populous city in the U.S. state of Georgia with a 2010 population of 420,003. Atlanta is the cultural and economic center of the Atlanta metropolitan area, which is home to 5,268,860 people and is the ninth largest in the U.S. It is a major component of a growing southeastern megalopolis known as the Piedmont Atlantic Megaregion. Atlanta is the county seat of Fulton County, and a small portion of the city extends eastward into DeKalb County.

Atlanta began as a settlement located at the terminus of a railroad line, and it was incorporated in 1845. Today, the city is a major business city and the primary transportation hub of the Southeastern United States (via highway, railroad, and air), with Hartsfield–Jackson Atlanta International Airport being the world's busiest airport since 1998. The World Cities Study Group at Loughborough University rated Atlanta as an "alpha(-) world city." With a gross domestic product of US$270 billion, Atlanta's economy ranks 15th among world cities and sixth in the nation. The city is a center for services, finance, information technology, government, and higher education. Metro Atlanta contains the country's third largest concentration of Fortune 500 companies, and is the world headquarters of The Coca-Cola Company, Turner Broadcasting, The Home Depot, AT&T Mobility, UPS, and Delta Air Lines. As of 2010, Atlanta is the seventh most visited city in the United States, with over 35 million visitors per year.