For a long time, Philadelphia's Delaware Riverfront was...underwhelming.
Each winter, the city operated a harbor-side ice skating rink. There were also summer concerts and festivals on the waterfront, bursts of life that would fizzle out as soon as the events ended.
But most of the time, people didn't venture down to the river. For one thing, getting to the waterfront requires finding a place to cross I-95, the 10-lane highway that cuts through the city.