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Seattle Underground Skylight

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flickr-32121683755.jpg Seattle SunriseThumbnailsSecond AvenueSeattle SunriseThumbnailsSecond AvenueSeattle SunriseThumbnailsSecond AvenueSeattle SunriseThumbnailsSecond AvenueSeattle SunriseThumbnailsSecond AvenueSeattle SunriseThumbnailsSecond AvenueSeattle SunriseThumbnailsSecond Avenue

Manganese glass prisms mounted in the sidewalk to illuminate the earlier (pre-1889) lower level sidewalks.