I have regrets over missing easy opportunities to see major cities.
Ottawa: I overslept and missed the bus for a college trip. A roommate could have woken me up but thought I wanted to sleep in. I was really planning to go.
Philadelphia: About 30 miles away in the late afternoon I thought I had done enough driving for the day and dismissed the idea of visiting. Now I realize I should have just forged ahead and seen at least a couple of sights.
New Orleans: I had driven a charter bus for a fishing trip less than 30 miles away and the idea of visiting was proposed. Since I had not researched where to drive or park, I was too nervous about the idea to consider it. This was a few months before Hurricane Katrina, and now it's too late to see the city the way it was at that time.