You won’t find any mail waiting within these mailboxes. Peer inside, and you’ll instead catch a glimpse of an ever-changing public art installation.
Mailbox Art Space (formerly Mailbox 141) is an alternative space that encourages artists to experiment and showcase new work (as long as it fits into the letterboxes, that is). Artists are invited to come up with an idea related to an exhibit’s given theme.
About the source: Atlas Obscura
Atlas Obscura aims 'to inspire wonder and curiosity about the incredible world we all share'. You can contribute to their collection on their website.