No matter which big U.S. cities you might visit, you'll find plenty of local sightseeing tours. But you don't have to pay top dollar for a private tour. In many cities, public transit trips serve spectacular routes at inexpensive transit fares, offering flexible schedules and avoiding extended stops at schlocky souvenir shops. Here are three favorite public trips in the U.S. that should be on your “must” list whenever you visit the region. I update this list every few years to show current service levels and fares.
