Bird's-eye view from the Observatory. George's Hill, Fairmont Park.

Bird's-eye view from the Observatory. George's Hill, Fairmont Park.

Bird's-eye view from the Observatory. George's Hill, Fairmont Park.

Agricultural Hall. Centennial Interntaional Exhibition, 1876. Fairmont Park, Philadelphia.

Horticultural Hall. Centennial Interntaional Exhibition, 1876. Fairmont Park, Philadelphia.

Machinery Hall. Centennial International Exhibition, 1876. Fairmont Park, Philadelphia.

The Centennial photograph of "Old Abe," the live Wisconsin war eagle. Agricultural Hall, (International exposition), Philadelphia, 1876.

Stereoscopic views of the Centennial Exhibition, 1876, Philadelphia.