D.C. and Baltimore: Two great American cities divided by 40 miles, a not-so-bitter sports rivalry and endless banter about which city's [contested area of civic pride] is better. Here's the truth: Both cities are definitely worth visiting, and doing so will become much easier when weekend MARC service between Union Station and Baltimore's Penn Station begins Dec. 7.

Baltimore, land of opportunity. (Katherine Frey / The Washington Post)

For D.C. dwellers, there's plenty of exploring to do in Charm City. Dinner at Woodberry Kitchen or Pabu? Beers at Of Love and Regret or Max's? A show at the Meyerhoff? That's most of my doing-stuff-in-Baltimore knowledge, so I'll see you on the MARC for additional fact-finding.

In May, the Maryland Transit Administration said eight or nine weekend round trips per day are planned for the Penn Line, which includes a stop at Baltimore-Washington International Thurgood Marshall Airport. Currently, the only weekend rail service connecting D.C. and Baltimore is the $16-and-up Amtrak. The same one-way trip would cost $7 on MARC.