Friday, March 7, 2025, 12:00 pm EST
Friday, March 7, 2025, 11:00 am EST
Friday, March 7, 2025, 9:45 am EST
Columbia University
Thursday, March 6, 2025, 2:00 pm EST
Thursday, March 6, 2025, 10:30 am EST
Wednesday, March 5, 2025, 12:00 pm EST
Wednesday, March 5, 2025, 10:00 am EST
Friday, February 28, 2025, 11:00 am EST
Thursday, February 27, 2025, 3:00 pm EST
Johns Hopkins University
Thursday, February 27, 2025, 8:00 am EST
Philadelphia Central High School for Boys and Pennsylvania State Arsenal, 1839. This daguerreotype, created by Joseph Saxton, is the oldest known photograph taken in the United States. Image courtesy of the Historical Society of Pennsylvania.
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