"They paved paradise, and put up a parking lot."

I need your help. I'm trying to list some of the best Orange County historical sites that are now parking lots. The Mission Yard and Reservoir site (at El Camino Real and El Horno St.) in San Juan Capistrano is a good example. Used as a watering hole, a reservoir, and a staging site for construction for well over two centuries, it's now a paved parking lot for the library.
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Another example is the parking lot at 5th St. and Sycamore in Santa Ana (shown above). At this site, in 1869, town founder William H. Spurgeon climbed a Sycamore tree so he could see above the tall mustard and get an overview of the land he'd just purchased. A younger sycamore tree has been planted in one corner of the parking lot.
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So,... What significant historic sites in your community (or others you know about) have been turned, completely or partially, into parking lots? Please leave your thoughts by clicking the "comments" link at the bottom of this post.
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Once I have a longer list of sites, I have a fun idea for what to do with them all. Details will follow after I flesh out the list a bit. Thanks in advance for your suggestions.
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(Update: Even if you don't have anything to add to the list, be sure to read some of the discussion in the "Comments" section. What a great thread! Thanks, everyone! Keep those ideas coming!)