With our brand new Undercity: Las Vegas video dropping on August 30th, we've been doing a lot of thinking about Sin City.

One of America's most modern cities, Las Vegas grew from a dusty mining town into a global gambling mecca in the space of just a few decades. By the end of the 20th century, Las Vegas was a booming metropolis and far more than a gambling destination.

The last decade or so, however, has taken some of the shine off of Vegas's image. Unemployment in Nevada is among the highest in the nation, much of the rapidly expanding city lies empty as a result of tough economic circumstances.

While Undercity: Las Vegas examines the remarkable and largely unknown network of tunnels and sewers beneath the neon lights of the Strip, revealing the machinery that sustains the city, a photo gallery we found on The Huffington Post lays bare the broken dreams and failed promises of the Las Vegas that never became home to more than empty buildings.

Check out a few images below!