NEW YORK (WABC) -- If you've walked around New York City at all, you've seen these strange red and white linoleum tiles, embedded in different streets.
They all have a similar message.
The tiles are another New York mystery as no one has conclusively proven who placed them around the city, and new ones continue to pop-up.
The tiles can also be found in other northeastern US cities and as far away as South America.
Click on the video above to get the full story.
Hidden New York is an exclusive abc7NY series uncovering secrets of New York City. Click here to watch more stories.
Hidden New York: What are those mysterious tiles?
HIDDEN NEW YORK