South Grand has been named a "Great Street," a six-block area that boasts greater dining diversity than Epcot Center and serves as the walkable heart of Tower Grove South and Tower Grove East. Now anyone curious about the history of the street and its buildings can access all sorts of fascinating details — without ever leaving their couch.That's thanks to a joint initiative by the South Grand Community Improvement District and the Landmarks Association of St. Louis, which collaborated on an online "walking tour" highlighting the neighborhood's roots.…