Seven Mile Bridge

The Seven Mile Bridge is the signature engineering feat of the Florida Keys, a concrete span that carries the highway across the Moser Channel and lets you drive for about seven miles with open ocean on both sides. It opened in 1982 as a replacement for the original bridge, built by Henry Flagler's railroad crews in 1912 and later converted for cars, and the old structure still runs parallel to the new one. The drive takes only a few minutes at highway speed, but the experience of a long, empty horizon, brilliant turquoise water and a sky that seems to merge with the sea makes it feel much longer, and it is one of the most photographed stretches of road in Florida.

The old bridge is worth a stop. A section reaches Pigeon Key, a small island that once housed railroad workers, and later served as a research and education site. A restored stretch of the old bridge is open to walkers and cyclists in some conditions, and the island offers guided tours and a small museum on railroad history.

Access, hours and fees change, so check with the island's operators and local authorities before you plan a visit. Even if you stay in the car, you can pull off at Marathon's end of the bridge and see the old trestle, with its rusted ironwork and the pale shape of the island beyond.

Drivers should take care. The speed limit is posted and enforced, there is no shoulder to speak of, and traffic can back up after accidents or during holidays and special events. Do not stop on the bridge, and keep your eyes on the road even when the view is tempting.

On windy days the bridge can feel exposed, and high-profile vehicles may be affected by gusts. The best photographs are taken from approved pull-offs and from the parking areas near the ends, where you can include the old bridge in the frame. Dawn and sunset produce the best light, with long shadows and glowing water.

The bridge is a natural part of any drive between Marathon and the Lower Keys, and it connects well with Bahia Honda to the south and Key West beyond. If you prefer a guided approach, a self-guided driving tour with narration can add historical context about the railroad, the 1935 hurricane and the highway that replaced it.

For a different perspective, a sunset cruise from Marathon passes beneath the bridge and shows its scale from the water. Confirm road conditions and any closures before you travel, especially in storm season.Cyclists and runners sometimes use the old bridge as a destination, and the annual running event across the bridge draws many participants.

If you drive, allow time for a stop at Pigeon Key or at the viewpoints near Marathon, and treat the crossing as part of the scenery rather than a stretch to speed through.If you are planning to photograph the bridge, check the sun angle before you go: afternoon light from the west flatters the old spans, while morning light fills the sky over the Atlantic.

Many travelers combine the crossing with a stop at a beach or restaurant on either side, because the drive itself can feel like a pause between places. Remember that cell signal and parking can be limited around the bridge ends, so download directions in advance.