Due to the sheer depth of Seattle's Lake Washington, a regular suspension bridge was out of the question. The new floating bridge, SR 520, measures at 7,710 feet, boasts a 14-foot-wide path for pedestrians and bikes, and is engineered to be more resistant to earthquakes, waves, and high winds. The older bridge, built in 1963, currently sits parallel to the SR 520, but will likely be torn down within the year.

After about four years of construction, "over 12,000 people celebrated the grand opening with a 10K race that traversed the floating marvel. After the race, food trucks, science exhibits, and the presentation of a Guinness World Records certificate entertained the 25,000 to 30,000 people that came to see the bridge," says Inhabitat.

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