seattle underground...

http://www.atlasobscura.com/places/seattle-underground

http://www.atlasobscura.com/categories/tunnels

http://www.atlasobscura.com/places/seattle-metaphysical-library

http://www.atlasobscura.com/things-to-do/seattle-washington

http://www.atlasobscura.com/places/space-needle