In 1913 a man who disliked the intrusion of automobiles began cutting horse roads through land on a Maine island, and did not stop until 1940. There are 45 miles of them inside the national park now, he financed 16 of the 17 stone-faced bridges, and cars are still barred.

The car came late to Mount Desert Island, and not everyone was glad to see it. Cars were banned from parts of the island for years. When the ban finally lifted, one wealthy summer resident had already decided he wanted somewhere to travel by horse and carriage that no engine could ever reach. So he started building. What he set in motion between 1913 and 1940 is still there, still off-limits to cars, and still doing exactly what he intended.

The man was John D. Rockefeller Jr., who had bought a summer home in Seal Harbor a few years earlier. He was a skilled horseman, and he wanted to ride the island without meeting the noisy new machines on its roads. According to the Federal Highway Administration’s history, he set out to build a system of horse roads across the island’s most scenic land, with no cars allowed. 

What one man’s objection actually built

The scale is the part that surprises people. Rockefeller didn’t lay out a scenic loop or two. He designed, funded, and personally directed a road network that now runs about 57 miles across the island. Of those, 45 miles sit within Acadia National Park today. The rest lie on nearby private land. He paid for all of it, at a cost the state’s tourism office puts at roughly $3.5 million.

These are not casual dirt tracks. They were built up in layers of crushed stone so they would hold together and drain, and the care was deliberate. The Federal Highway Administration’s history describes an elaborate system of horse roads and granite bridges, graded gently enough for a horse pulling a carriage and laid out to follow the shape of the land rather than fight it. The middle of each road was raised six to eight inches higher than the sides so Maine’s wet weather would run off. Large granite blocks line the edges as guardrails. The Park Service notes that “these coping stones have been affectionately called ‘Rockefeller’s teeth.'”

Sixteen of seventeen bridges

The bridges are where the project stops being roadwork and becomes something closer to private architecture. As National Geographic’s Jill K. Robinson reports, Rockefeller financed 16 of the 17 bridges along the roads, crossing cliffs, streams, other roads, and waterfalls. The Park Service counts them the same way, and notes each bridge has its own design.

Underneath, they are modern: steel-reinforced concrete. What you see is not. Robinson describes bridges that “utilize native stone on their surfaces, and each of them is unique in design.” The granite came from the island itself, cut and set by hand. And Rockefeller wanted the seams to show. According to the Park Service, the stones were cut roughly and spaced unevenly to look rustic, exactly the effect he was after. A man financing his own bridges, asking the masons to leave the stone a little rough so it wouldn’t look too finished. That instruction tells you as much about the whole project as any mileage figure.

Why the cars are still barred

What keeps the roads worth writing about a century on is the one thing that hasn’t changed: cars are still banned from them. The original objection has simply held. You can walk, ride a bike, ride a horse, or take a carriage, and that is the whole list.

Our read is that the ban isn’t really about nostalgia for the horse-and-carriage era. It’s about pace and sound. A road built to be traveled at the speed of a walking horse gives you the land at that speed, and the absence of engines gives you the quiet Rockefeller was protecting in the first place. The gentle slopes he insisted on for the horses turn out to be exactly what makes the roads pleasant to walk and easy to cycle. The design outlived its first purpose and found a second one.

Keeping something like this intact costs money, and it no longer comes from one man’s pocket. The Park Service maintains the roads together with the nonprofit Friends of Acadia, whose endowment puts more than $200,000 a year toward their upkeep. A private obsession from 1913 became a public place that thousands of people use precisely because it was built to keep the noise out.

What a visitor gets today is close to what Rockefeller was chasing when he first objected to the car. Granite bridges left a little rough, roads crowned to shed the rain, and no engine sound anywhere on 45 miles of it. He disliked the intrusion enough to spend nearly three decades building somewhere it couldn’t follow him, and the barrier still works.