Annual charity stair climbing events nationwide where firefighters climb 110 stories in full gear to honor those lost on 9/11.
Historic marble stairs of the Lincoln Memorial, site of Martin Luther King Jr.'s 'I Have a Dream' speech and countless protests and celebrations.
Monumental spiral staircase sculpture by Jochen Gerz descending into the ground, commentary on memory and history.
897 steps inside the Washington Monument, normally closed to public but used for annual stair climbing charity events.