Brick walkway and buildings at Harvard Business School, in Boston, Massachusetts. - Stock Photo & Image

Brick walkway and buildings at Harvard Business School, in Boston, Massachusetts.

Brick walkway and buildings at Harvard Business School, in Boston, Massachusetts.

Red brick college dormitory with a bicycle and trees.

Walkway and Dow Hall, on the campus of Yale University, in New Haven, Connecticut.

Historic brick buildings along Spruce Street in Washington Square West, Philadelphia, Pennsylvania.

Buildings at Washington Square, in Philadelphia, Pennsylvania.

Buildings and walkways at the Harvard Yard, at Harvard University, in Cambridge, Massachusetts.

Buildings at Washington Square, in Philadelphia, Pennsylvania.

Cobblestone streets and historic row houses in Society Hill, Philadelphia, Pennsylvania.

Row houses near Rittenhouse Square, in Philadelphia, Pennsylvania.

Historic brick row houses along Waverly Street, in Philadelphia, Pennsylvania.

Garden and apartment buildings in Alexandria, Virginia.

Steinman Park, in downtown Lancaster, Pennsylvania.

Historic brick building in downtown Annapolis, Maryland.

Walkway and apartment buildings in Alexandria, Virginia.