Like many (historical) sites—not to mention commercial amusement parks—the National Mall in Washington D.C. requires a lot of walking for stereotypical tourists, who are, stereotypically, going to end up pooped from such on-foot excursions.

As noted in a previous column, my family stayed at an older hotel in downtown Washington, about a quarter mile from the Mall, which meant we walked to that 1.9 mile-long rectangle three days in a row. Fortunately, it wasn’t too hot, nor did it rain.