Although I've never visited San Francisco before, it's not hard to envision a city that is more concrete and asphalt than green grass and trees--thankfully this city is turning a new leaf with a project known as 'Pavement to Parks.'
Since San Francisco has a lot of wasted space that is uselessly paved, they are in the process of introducing mini-parks through 'Pavement to Parks.' There are three so far and hopefully more to come--perhaps in other cities as well.
Wasted Space Conversions
More Stats +/-
Garbage Dump Turned Eco-Theme Park
Cross-Cultural Statue Parks
Sinuous Eco-Friendly Rooftops
Prehistoric Lawn Ornaments
Parking Lot Landscaping