The Underline park drawing proposed for Brickell Station in Miami. (Source: James Corner Field Operations, Courtesy of Friends of The Underline.

Meg Daly walked home from a train station in Miami one day and had an inspiration that could change how people look at parks in the future.

First of all, she wasn't looking at the ground. She looked up. At the Metrorail mass transit line running overhead and realized that the concrete structure holding the tracks created a nice shady spot below.

For anybody who has ever lived or visited Florida, you know shade is precious. Meg had an idea - if there are miles of shade underneath Metrorail, wouldn't this make a great elongated park where people could walk, bicycle or relax?

"I lived in Miami my whole life and never really experienced that moment under the Metrorail. In that moment I realized just how much land was there," she said. "I thought, 'Why don't we do something spectacular with this space and return it to the