This wiki offers partial solutions for the 2 casques that have been found:
This wiki also currently offers detailed (but unproven) solutions for 8 more casques. None of these proposals can be considered definitive or correct unless a casque is found. Unfortunately, in at least a few cases (Charleston and New Orleans), the casques appear to have been destroyed. But in other cases (San Francisco, St. Augustine, and Houston) there still seems to be a good chance of recovery, if a dig is done the right way with the full permission and cooperation of the relevant property owners.
Image 1, Verse 7: San Francisco Status: Buried under a layer of asphalt
This is the image associated with immigration from China. The woman's dress is a map of Golden Gate Park, rotated 90 degrees so the western edge is at the top. Clues from the image and verse narrow our attention to a small slice of the park directly east of the elevated Highway 1 (Crossover Drive). After leading us on a stroll through the park, the puzzle brings us to a long staircase that has a handrail (or pole) going up the middle. The casque was buried directly across from the top end of the pole.
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Status: Destroyed when the Maine capstan monument was replaced
The shapes of Fort Sumter and the Charleston peninsula send us to the correct area (from the image). Historical references confirm the city and direct us to a historical area (from the verse). A line about "two arms extended" (verse) is ambiguous, but black circles with white dots (image) tells us that the arms are cannons. A line about "May 1913" (verse) sends us to the capstan from the USS Maine. References to palms (both image and verse) tell us to dig where the shadow of a nearby palm tree would be positioned at the base of that monument.
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Image 3, Verse 11: Roanoke Island Status: Unclear
Detailed steps (from the verse) take us from the Outer Banks of North Carolina over a bridge to Roanoke Island. An outline of the island (from the image) confirms that we are in the right place. A series of instructions (verse) takes us down the path to the Waterside Theatre. A tower made of hollow metal pipes is a symbolic match for the suit of armor (image) and it has symbolism in the play as the tree last touched by the colonists (verse). The casque was buried in the sand at the base of the tower at a spot where one could look across to the wing of the Wright Brothers National Memorial.
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Image 6, Verse 9: St. Augustine Status: Underneath a volunteer cabbage palm on private property
The image of a Spanish conquistador atop the outline of Florida ties in with the book's immigration theme and tells us to look for a spot associated with the arrival of Spanish explorers on the Florida peninsula. Abundant map and location details confirm that our destination is the Fountain of Youth Archaeological Park. The alignment of a fountain and the moon-like dome of a building pinpoints the exact spot for the dig.
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Status: Destroyed in the construction of Place St. Charles
Various Mardi Gras clues get us to downtown New Orleans. The image and verse guide us down Lafayette Street to the Piazza d'Italia, which is shaped like a series of concentric circles interrupted by the shape of Italy. From there we can follow either of two paths as shown by the arrows around the clock face. Our final destination is the block where the St. Charles Hotel once stood before it was torn down in 1974.
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Status: Buried under a hardpacked gravel path
Latitudes & longitudes get us to Houston (from the image). The "number 982" sends us to an antique steam locomotive at Hermann Park (from the verse). By lining up the train smokestack and a fountain in the lake (image) and stepping across the tracks of the miniature train (verse), we should arrive at a group of four trees (verse). That spot also gives a single-point perspective over the receding ties on the train bridge (image & verse). The casque was buried in the middle of the four trees.
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Status: Unclear
Views of the Milwaukee City Hall get us to the city (from the image). A very detailed walk-through takes us from the University of Wisconsin-Milwaukee to Lake Park and to the Grand Staircase (from the verse). Images of lawn bowling and a cicada nymph confirm that we are meant to turn right at the top of the stairs (image). We are guided down the Locust Street Ravine Trail to a group of birches (verse) where we would see some symbol on a tree (verse) and the confirming image of a cement disk (image). Preiss probably meant this to be one of the easiest of all the puzzles, but the removal of the group of birches took away the crucial clue for the final spot.
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Status: Unclear
The Paul Revere reference gets us to Boston. The names of two ancient Greek historians gets us to Copley Square. The box with a light coming from below sends us into the subway and an obscure reference to a letter by Horace Walpole sends us west five stops on the Green Line. A reference to a "green tower of lights" tells us to walk to Fenway Park via Kenmore Square. Visual references to gardens and monuments tell us to proceed through the Back Bay Fens. By exploring the area we discover a curious little park with two circles of brickwork. Various references to the sidewalk, bridge, and utility boxes at the site confirm that we are in the right place. Standing with our back to the steps should put us in the right place to dig.
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From what we know so far, it appears that every puzzle in The Secret has its own way of combining the clues in the verse and the image. There is no single "master system" that will solve all the puzzles. Nevertheless, there appear to be certain common themes or approaches that are common to all of the puzzles. One way to understand these commonalities is to view each solution as a set of three progressions that Byron Preiss was making.
In short, the easiest clues in The Secret are generally there to identify large, county-size areas by hinting at their most iconic and heavily visited spots. Once you know that general area, the increasingly subtle and obscure clues will narrow down the search area into smaller and smaller places that are off the beaten path. The most subtle and obscure clues - that is, the ones that would never appear in any history book - are the ones that should tell us we are finally on the exact spot for the casque.