Ever wondered why you can drive from Alaska to Argentina—except for one small gap? That’s because of the Darien Gap, a 100-mile stretch of dense jungle and swamps between Panama and Colombia. It’s wild, dangerous, and practically impossible to build a road through, thanks to the rough terrain, extreme weather, and local wildlife (think snakes and jaguars!). Governments have also avoided building a highway there to prevent illegal activities like drug trafficking from spreading even more easily. Some adventurers have crossed it on foot or by bike, but it’s no easy trip. So, for now, the Pan-American Highway remains broken, and the Darien Gap stays one of the last true roadless frontiers!

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