A detail from yesterday's post of picnickers at Marshall Hall.

Ornithopter. Hand-colored lithograph c. 1800-1830. View full size. Tissandier Collection, Library of Congress.

"Washington Monument as it stood for 25 years," 1860. Glass-plate (wet collodion) photograph by Mathew Brady. View full size.

1910 Irving Underhill photo of the 22-story Flatiron (Fuller) Building at 175 Fifth Avenue, one of the earliest (1902) buildings in New York to attain such heights. View full size. More here.

Picnic at Marshall Hall, Maryland, 1893. View full size. Photograph by William Cruikshank. View even larger. Across the Potomac River from Mount Vernon, Marshall Hall was a Colonial era estate whose grounds were used for picnics, concerts and camping. The house burned down in 1981. [Note fingerless gloves worn by ladies on the right, and loud suspenders of man on the left. - Dave]

"The Anxious Moment." Poker game at Camp McKibbin, Marshall Hall, Maryland, 1893. With members of the 2nd, 3rd and 6th battalions of the District National Guard. View full size. Photograph by William Cruikshank.

Gen. John F. Hartranft reading the death warrant to the four condemned Lincoln assassination conspirators (Mrs. Surratt, Payne, Herold, Atzerodt) on the scaffold at Fort McNair, Washington. July 7, 1865. View full size. Photograph by Alexander Gardner. More execution photos at GhostCowboy.