You still use the old "Poly" on North Avenue as a reference for directions.

 If you were interested in motorcycles, you could buy a Honda at Pete's in Hamilton, a Triumph at Boutwell's on Broadway, a Harley at Baltimore HD on Loch Raven Blvd, a Beemer from Motor Sports Center on Pinckney Rd, or a Yamaha from Frankie & Ronnie's on Route 40.

 Speaking of Ronnie, how about Baltimore's own Ronnie Dove?

 You remember when Baltimore had three passenger train stations:  Penn
 Station, Camden Station, and the B&O Station on Mount Royal Avenue.

 It also had a functioning light rail system.  The city and adjoining counties were linked by street cars, which plied the tracks for 104 years before the busses ultimately won on November 3, 1963.  One of the last survivors was the No. 8 line, which ran between
 Catonsville and Towson.  There are still a bunch of huge old car barns around: York Road in
 Govans, Harford Rd in Hamilton, Belair Rd in Overlea, Retreat Street, and
 the monster on Washington Blvd, to name a few.

 Car drivers, bicycle riders, and pedestrians had to avoid street car tracks long after the street cars were out of business. It took years to dig up the tracks, and some are still evident on paved-over cobblestone streets.  Now we are spending a gazillion dollars trying to
 re-create the original version of light rail.

 You can remember what the harbor looked like before it was The Inner Harbor, and that Connolly's Restaurant on Pier 5 was the last survivor of the old Pratt Street waterfront.

You know why Pigtown is called Pigtown.

You remember swimming and family picnics at Beaver Dam and Beaver Springs Swim Clubs in Cockeysville, and no one knew of a place called Hunt Valley.

You remember when there was home delivery of the Morning Sun, The Evening Sun, The Sunday Sun, The News-Post, and The Sunday American. The last two were later the News-American, and all long before the City Paper made its debut.

You know what/where the 9th Ward is.

You remember when White Marsh was just a marsh, Owings Mills was just a
 farm, and Columbia was a utopian dream (and a farm).
 You still don't get the whole "Town Center" thing and maybe you shouldn't
 ....... it's just a mall!