If you’ve taken the Seattle Underground Tour, you know that much of the older portions of downtown, specifically Pioneer Square were originally built a story lower. Due to a number of reasons Seattle was forced to build the streets up a full floor leaving bizarre remnants of window frames buried in alleys. This one was so close to having some light shine through, but instead was bricked up and paved over, never to be open again. Thankfully, just out on the main street, there are a ton of the original purple squares of glass, allowing light down into Seattle’s catacombs.