When you want to combine physical exercise and a mental workout, head to the Baltimore and Annapolis (B&A) Trail. You can bicycle, inline skate, walk, learn about the solar system, study local history, garden, or attend a concert. This delightful 13.3-mile, eight-foot-wide paved path runs between Boulters Way in Arnold and Dorsey Road in Glen Burnie using the former railbed right-of-way of the old Baltimore and Annapolis Short Line Railroad.