The New York City Department of Sanitation was established in 1881 to attack an overwhelming problem. New York City of the late 19th century was plagued with relentless filth. Horses left 2.5 million pounds of manure and 60,000 gallons of urine on the streets every single day. The unceasing expansion of the city left layers of grime on the streets.

The 51-foot monument to General William Jenkins Worth near Madison Square Park is the second oldest monument in NYC. (The oldest is the statue of Washington in Union Square.) It is also one of only two New York monuments that serve as a mausoleum. (The other is Grant’s Tomb.)

The men and women of the New York City Department of Sanitation are vital first responders. History has thrown many challenges the agency’s way and each time DSNY has risen to the occasion.

Take a look through some of our partners' favorite stories from this year.

Are you ready for a closeup? Try your hand at re-creating these historic photos at Madison Square Park! This challenge is only available to our iOS app users. If you don't yet have the Urban Archive App, download it here. Each location in this challenge has an address and a historic image tied to it. Check-in at each location by tapping the lock icon to the left of the clue. If you’re in the right place, it will turn green. Your challenge today is to take as many then-and-now photos as you can. Tap the image, and then the recreate button to line up the historical image with your present-day view. Once you’re happy with your photo, hit save to add it to your camera roll. Please share these photos with team@urbanarchive.nyc once you’ve completed the challenge. Happy snapping!