Author of 'Hidden Staircases of Washington DC: A Walking Guide with 75 Stairways' documenting the capital's overlooked pedestrian stairways.
Grand marble stairs on the east front of the US Capitol where presidential inaugurations take place, symbol of American democracy.
Steep 75-step staircase in Georgetown made famous by the 1973 horror film The Exorcist, now a popular tourist destination.
Historic marble stairs of the Lincoln Memorial, site of Martin Luther King Jr.'s 'I Have a Dream' speech and countless protests and celebrations.
897 steps inside the Washington Monument, normally closed to public but used for annual stair climbing charity events.