I-81 is beautiful. I used to live in Roanoke, and would travel up and down the Shenandoah, viewing the rolling green hills from my car. Where possible and time permitted I would travel on the Blue Ridge Parkway, taking in the scenery and investigating the history of the area.
But still, my favorite Interstate is on the 'north shore' area of Louisiana, on the stretch of I-55 north of its termination at I-10 and south of Manchac. You drive on an elevated highway with Lake Pontchartrain on one side and Lake Maurepas on the other. The Maurepas side also has the typical bayou scenes with cypress trees, Spanish moss, stilted homes and shallow water. At sunrise the sun glistens off Lake Pontchartrain; at sunset the sun gives a fiery glow to Lake Maurepas.
It always brings back the memories of me and my friends being in each other's pirogues while fishing or crabbing there in the bayou. Of days where time really wasn't a factor and you were there catching your dinner and spending time with friends.
I was on that stretch of highway not too long ago. Katrina left many scars, not all of which will heal.