An early sitcom and theme song set Route 66 into the minds of the world, as the cross country route in the United States. Tourists from around the globe come to drive the sections of the original route that still exist, though most of it has been replaced by modern limited access Interstate Highways.
The Lincoln Highway was another one, running from Times Square in New York City to San Francisco, we came across this marker for it in Carson City, Nevada, not far from the Nevada State Capitol building.
Then there is US Route 50, that ran from Ocean City Maryland to Sacramento California. We kept driving sections of it in Nevada and California, it runs along the south shore of Lake Tahoe. It also passes near where we live in the Washington DC area.
It might be fun someday, to take a month and drive the old roads, as much of them as still exist, from coast to coast. Maybe something to do in retirement.