(CNN) -- [Updated 3 p.m. Monday, February 27] Revelers perform on a monster-like float during the second night of Carnival last week in Rio de Janeiro, Brazil.
About 850,000 tourists visited Rio for the five-day celebration, according to tourism officials.
The procession above took place in front of 70,000 people. It was also broadcast internationally.
CNN.com reader "msteffen" was first to answer Rio in the comment section. But some interesting responses, including "inside the mind of an average high school student," "White House news conference" and "the Republican debates," suggest that maybe this week's photo challenge could have been a bit more challenging.
[Original post] Do you know where this photo was taken?
If you think you know the answer -- or if you just want to take a wild guess -- post it in the comments area below. Later in the day, we'll reveal where the photo was taken and give credit to those who figured it out first. (The more detail, the better!)
Each Monday morning, we'll post a new photo and challenge you to tell us its origin. The photo might be related to a prominent news story or theme -- or it might just be something that caught our eye.