The world's longest road network is technically broken in the middle of the jungle.

Countries & Cities · Published 29 September 2026 Swipe more like this →

In short: Stretching 30,000 kilometers from Alaska to Argentina, the Pan-American Highway is a monumental feat of engineering. Yet, it remains incomplete. A dense, roadless rainforest known as the Darién Gap separates Panama and Colombia, forcing travelers to ship their vehicles across the divide rather than driving the entire route.

The vision for an inter-American connection began in 1884 with a U.S. congressional plan for a railroad, but the project stalled as focus shifted toward the Panama Canal. By 1923, the rise of the automobile prompted a shift in strategy, leading to the 1937 Convention on the Pan-American Highway. Signatories from fourteen nations, including the United States, Canada, and several Latin American countries, committed to building a cohesive network of roads.

Today, the system is a complex web rather than a single path. While the U.S. government considers its entire Interstate Highway System part of the network, no specific road in the lower 48 states or Canada is officially marked as such. In contrast, many Latin American sections are clearly designated as Vía Panamericana. The route is also a patchwork of history; for instance, the stretch of I-25 in New Mexico follows the ancient Camino Real, while other segments were developed as late as the 1940s to secure access to the Panama Canal.

The most significant hurdle remains the Darién Gap. Environmental concerns and opposition from both Panama and Colombia have prevented the construction of a road through this dense wilderness. Consequently, the highway remains a de facto collection of regional routes. While adventurous drivers can navigate from Prudhoe Bay, Alaska, to the southern tip of Argentina, they must rely on maritime transport to bypass the gap, leaving the dream of a truly continuous overland route from the Arctic to the Antarctic unfinished.

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