Another portion of the tunnels on Amtrak's northeast corridor through Baltimore, Maryland. Again, this is the busiest and most technologically advanced passenger line in the United States.

These two photos show just part of a huge industrial complex that has been partially demolished over the past few years.

One of many billboards I've seen in Baltimore along these lines. Some advocacy group thinks it can eliminate the by-products of social inequality by screaming at residents of the city about how they need to act.