Here is a great old photo from the Maryland Historical Society. This is a terrific resource, and you should think about donating to them to help support preserving Baltimore and Maryland history.
Biddle Alley, ca. 1911. Baltimore, Maryland. Subject Vertical File, Baltimore City, Streets. Featured in Housing Conditions in Baltimore: Report of a Special Committee of the Association for the Improvement of the Condition of the Poor and the Charity Organization Society, Submitting Results of an Investigation by Janet E. Kemp