Windley Key Fossil Reef Geological State Park is a Florida State Park located at mile marker 85.5 near Islamorada. It was a former quarry used by Henry Flagler in the early 1900s to help his building of the Overseas Railroad. Following the railroad's completion, it was a source for decorative stone pieces called Keystone. Now on display are exposed sections of fossilized coral, as well as some of the original quarry machinery. The Hurricane Monument at Mile Marker 82 in Islamorada is constructed of keystone from the quarry.

Windley Key Fossil Reef Geological State Park
IUCN category V (protected landscape/seascape)
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Location	Monroe County, Florida, United States
Nearest city	Islamorada, Florida
Coordinates	24°56′57″N 80°35′46″W / 24.94917°N 80.59611°W / 24.94917; -80.59611
Established	1999
Governing body	Florida Department of Environmental Protection