If you're actively playing the game you're aware that there's a seasonal event going on right now (Apr. 21st - May 12th). One of the activities is to find 40 corrupted paper lanterns strewn around the Washington map.

Some of them are pretty easy to spot, while others can be rather tricky so community got together to map all of them out for easier clears. Most people interested in this are probably already on TD's subreddit but in case you're not, I thought I'll drop it here as well.

Shamelessly stolen from reddit, obviously.