One-Eyed Willy's map

One-Eyed Willy's map is the map that led to his treasure and his ship, The Inferno. Irving Walsh had it kept framed in his attic, apparently as one of the rejected items from his museum.

Details
Dating back to the 17th century, One-Eyed Willy's map comes paired with a doubloon, meant to be used in conjunction with Haystack Rock on Cannon Beach. The entire thing is covered in notes and riddles written in Spanish; on the back is a series of musical notes meant to be played on a piano of sorts. It is intended to be folded up to form certain parts of the maps hidden to the untrained eye.

Involvement
Mikey finds the framed map and hands it to Chunk, knowing that his clumsy friend will eventually break the frame, like he does with most things he touches. Once freed from the frame, the rest of the Goonies take a look at it as well. The written text on the map is in Spanish, which Mouth is able to translate.

The Goonies take the map with them on their adventure to find One-Eyed Willy's "rich stuff". The doubloon points them to the starting position of the map, ultimately leading them to the Lighthouse Lounge to find the entrance to the secret caves.

Over the night, Mouth deciphers the various puzzles and riddles to be solved. Andy is the one to play the Bone Piano, narrowly letting them escape with their lives to the The Inferno to discover the treasure.

Behind the scenes
The map was designed specifically with MAD Magazine in mind, taking inspiration from the magazines' fold-ins. Production designer J. Michael Riva personally aged the map, using mink oil to darken the paper and a Bunsen burner to burn the edges.

Trivia

 * In the Stop 'N Snack deleted scene, Troy grabs the map, rolls it, and lights up the end like a cigarette. Supposedly, the burned edges from this can be seen throughout the movie.