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Why is the Castro called the Castro? Actually it wasn't always called that. Depending on your time machine visit you could be stepping into the area called Eureka Valley, Horner's Addition, Rancho San Miguel, or Little Downtown. Come nerd out on this historical and architectural tour of one of the most famous neighborhoods in San Francisco with SF City Guide Lisa Ryers '90.

We'll be meeting at the Giant Rainbow flag at the southwest corner of Market and Castro promptly at 3 PM.