Construction has started on the "Tunnel Tops" park which will be built above a former roadway along the water in San Francisco. (Art from Presidio Trust, Golden Gate National Parks Conservancy

In clever reuse of urban space, a 14-acre park will be built in San Francisco near the water over two freeway tunnels within sight of the Golden Gate Bridge.

The $110 million project will include thousands of native plants, trees, meadows, trails, gardens plus a community plaza and youth education center. It is scheduled to be completed in 2021.

The project called Tunnel Tops, is part of the popular Presidio area, which is a former military base overlooking the bay and Golden Gate Bridge.

Tunnel Tops is another park project in a similar vein as the famous HighLine in NYC, the Beltline in Atlanta or the just started Underline