<p><table class="image-container float_right" width="200"><tr><td><div class="image"><img src="http://static4.businessinsider.com/image/50fde45f69beddb93c000011-590/inauguration-barack-obama.jpg" border="0" alt=" inauguration barack obama" /></div><p class="source">AP</p></td></tr></table>An estimated 800,000 people descended on Capitol Hill Monday to celebrate the start of President Barack <keyword id="16284" type="PERSON" weightage="60" keywordseo="Obama">Obama</keyword>'s second term with a day of political pageantry. </p>
<p>From Bill Clinton's Kelly Clarkson photo bomb to Joe Biden's triumphant walk down the National Mall parade route, we've compiled our favorite images from the day's festivities.</p>

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33 Unforgettable Photos From Barack Obama's Inauguration Day

APAn estimated 800,000 people descended on Capitol Hill Monday to celebrate the start of President Barack Obama's second term with a day of political pageantry. From Bill Clinton's Kelly Clarkson photo bomb to Joe Biden's triumphant walk down the National Mall parade route, we've compiled our favorite images from the day's festivities.

33 Unforgettable Photos From Barack Obama's Inauguration Day

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