Update on March 22nd, 2014
When Portland, OR was first built, it had a network of underground tunnels underneath the entire city. These were known as the Shanghai Tunnels. This is where the term "I've been shanghai'ed" came from. Some mild-mannered stiff would come into a bar, and drink way too much. Underneath the bar, pirates and seaman would wait for the right moment, then kidnap him, and sell him into slavery aboard some ship.
Here are the photos I took when I visited my little brother on March 24th, 2012.