Our first defined destination was Carlsbad Caverns National Park in southern New Mexico. We headed that way after crossing the Mississippi River by traveling through Arkansas and then all the way across the great state of Oklahoma. One of the interesting formations at Carlsbad Caverns On our way to Carlsbad, we woke up one Sunday morning in mid-April in Seminole, Oklahoma, about 50 miles from Oklahoma City. I glanced at a calendar and realized it was April 19, the anniversary of the Oklahoma federal building bombing in 1995. It was a little strange to drive through Oklahoma City on that particular date. Past Oklahoma City, I-40 parallels old Route 66, which is celebrating a centennial this year. We drove along a few sections of the original Route 66 a couple of years ago, coming back from Thanksgiving in Oregon, so we’ve seen some of the sights along the Mother Road, as John Steinbeck called it. I think about Steinbeck’s writing from time to time as we wander around; his Travels...