KEY LARGO, Florida Keys — John Pennekamp Coral Reef State Park continues to host a popular lecture series focused on Florida Keys history, archaeology, culture and environment. In their 19th year, the free, one-hour lectures are held inside the park’s Visitor Center at mile marker 102.5 oceanside, Wednesday evenings at 7:30 p.m. through March 31.

Sponsored by Dagny Johnson Key Largo Hammock State Park, the popular “Delicate Balance of Nature” talks are to be presented by field experts in geological sciences, ornithology, ecology and biology.

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“From Rail to Trail: Flagler to Now” is to be featured March 24. Listeners can learn about Henry Flagler’s Overseas Railroad and its transformation into U.S. Highway 1 — now designated an All-American Road — leaving a route of historic places for recreation. Trail specialist Monica Woll of the Florida Keys Overseas Heritage Trail is to share some fascinating history.

For all lectures, the park gates will open at 7 p.m., after normal operating hours. Visitors are urged to arrive on time to be assured of a seat in the auditorium, a wheelchair–accessible facility. Attendees may wish to bring a cushion for added comfort.

There is no charge to enter the park to attend the lectures. For more information and a complete listing of lectures, contact the John Pennekamp Coral Reef State Park Visitor Center at (305) 451-9570.

For information on accommodations in the Key Largo area, contact the area chamber of commerce at (800) 822-1088 or explore this Web site.