Today (Sat 4 Oct 2008) marks the 100th anniversary of DC’s Union Station, and also the 20th year since its reopening as a mixed retail and transport hub. Union Station and Amtrak will be celebrating with exhibits, memorabilia, and tours of historic train cars and locomotives.

More from Post’s Get There blog, DCist, and USA Today. Via Rebuilding Place in the Urban Space we get a link to Now Arriving Washington: Union Station and Life in the Nation’s Capital, an extensive dissertation in progress, with a wonderfully voluminous history section.

So be there. Bring cameras.