Most people overlook the history behind most things. You may just look at Penmar Golf Course and Penmar Park in Venice, and say that they are just normal recreational areas that just happened to be built there. You may just say that the Lagoon that bisects the "Silver Strand" in the Marina was just a remnant of Abbot Kinney's Canals. However, after closer inspection, one can learn that Penmar Golf Course was built on a vernal pool that would fill with water every winter, and that the "remnant" of the canals is truly a natural lagoon that once part of the ecologically diverse Ballona Wetlands complex, and that it was spared in the development of the Marina filled in nearly all of the wetlands.
A study by the Bay Restoration Foundation and USC has mapped the historical ecology of the Ballona Watershed, and has provided the information in a detailed manner, with images of the ecology superimposed onto google maps. You can find out what once existed where you now live, and what has survived the urban sprawl of Los Angeles over the past 100 years.
You can see the website, that includes historical ecology of the entire Ballona Watershed, superimposed onto google maps by visiting the link:
http://www.ballonahe.org/