As Metro prepares for the last bus ride through the Downtown Seattle Transit Tunnel on Saturday, March 23, we were thrilled to see the awesome photos King County Archives found and published on their Bytes and Boxes blog.

The first official bus trip through the Downtown Seattle Transit Tunnel on Sept. 15, 1990.

Many of these historical photos were taken in the late 1980s, showing the various stages of construction in downtown Seattle for the double-track, 1.3 mile-long transit tunnel that officially opened on Sept. 15, 1990.

King County Metro Route 41 will be the final scheduled bus trip in the tunnel, leaving Northgate at 12:30 a.m. and heading southbound through the tunnel to conclude its trip at International District Station (IDS) around 12:53 a.m.

However, Metro is planning to commemorate the moment with an additional ride through the tunnel on an original Breda bus as well as some special Metro coaches at 1 a.m. for riders who want to be a part of history. Get the details here.