ISLAMORADA, Fla. — Along Overseas Highway is the Windley Key Fossil Reef Geological State Park.

Formed of Key Largo limestone and fossilized coral, the land was sold to the Florida East Coast Railroad in the early 1900s.

Here are five things to know before you go:

1. Windley Key Fossil Reef Geological State Park is an old limestone rock quarry that was once used by Henry Flagler in the early 1900s to build his overseas railway, which ran from 1912 to 1935.

2. You can now visit the quarry and see the limestone which has thousands of fossilized coral in the rocks.

3. They also offer hiking trails where you can check out some of the machinery used to make the overseas railroad.

4. Windley Key Fossil Reef Geological State Park is open Thursday through Monday from 8 a.m. to 5 p.m. Admission into the park is $2.50 per person.

5. For more information head to their website or call them at 305-664-2540.