CNN  — 

For better or worse, the world’s cities are changing and we need YOU to help CNN document those changes.

Whether it’s the towering skyscrapers that have sprung up in Dubai, the hipster hangouts that now populate East London or the decades of decay that have set-in in Detroit, send us the pictures you think best emphasize the changes in your city or neighborhood.

Post your photos and stories via the blue button below or tag any images you would like to submit on Twitter, Facebook or Instagram with the hashtag #CNNMyCity.

Include a brief description of the location, note why the picture is important to you and tell us the change it displays. There’s bonus points for anyone that has before and after shots which compare and contrast the changes you describe.

The best submissions will feature on CNN and CNN.com throughout December.