From a Beach of Glass
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"Glass Beach" in Fort Bragg (Mendocino County, CA) is famous for its huge swaths of colorful, wave-polished beach glass.
Back before we knew better, this beach was the city dump. The dump was closed in 1967, and pounding waves have since reclaimed the beach—and left tons of beach glass behind.
At low tide, you can collect these sparkling little jewels and explore tidepools.