The dome of the Missouri State Capitol will be lit purple on Tuesday, March 11, for Missouri Alzheimer’s Awareness Day.

UNITED STATES - MARCH 26: Cherry blossoms bloom in Lower Senate Park with the U.S. Capitol dome in the background on ...

There is a secret staircase hidden in the Capitol dome, and it goes all the way to the top. Follow Tech Insider: On Facebook More from Innovation Thousands of people tour the US Capitol every year.

Gov. Mike Kehoe ordered the Missouri State Capitol dome to be lit purple Tuesday night in honor of Missouri Alzheimer's Awareness Day. The dome lighting hopes to raise awareness around the disease ...