Only the outlines of the panels remain. The signs were taken down under a directive from the Trump administration to take down anything the administration considered "disparaging" of America's history.
With the displays gone, some visitors struggled to understand what they were looking at.
SEE ALSO | Slavery exhibits at President's House in Philadelphia removed after Trump administration directive
"I have absolutely no idea what I'm looking at right now," said Fallon Berube, who was visiting Philadelphia with her family from North Dakota.
Others said the absence was unmistakable.
"This is a very important place for us. If you come here and it's empty, it's like a missing piece in our hearts," said Nasir Hawthorne, a senior at Constitution High School.
Reactions ranged from confusion to anger.
"Really sad. More than sad, it's outrageous. They're cancelling history," said Jane Pajor of Chicago.
Philadelphia officials say the federal government had no authority to remove the signs. The city has filed a lawsuit, citing a 2006 agreement between the federal government and the city governing changes to the exhibit.
"That agreement requires parties to meet and confer if there are to be any changes made to an exhibit," said Mayor Cherelle Parker.
In a statement to Action News, the Department of the Interior called the lawsuit "frivolous."
The statement reads in part: "The Department of the Interior is implementing Secretary's Order 3431, which carries out President Donald J. Trump's Executive Order on "Restoring Truth and Sanity to American History." All federal agencies are to review interpretive materials to ensure accuracy, honesty, and alignment with shared national values. Following completion of the required review, the National Park Service is now taking appropriate action in accordance with the Order."
The President's House opened in 2010 and gained new significance after slave quarters were unearthed at the site. For many visitors, seeing the stories of the enslaved removed was deeply upsetting.
"This is ridiculous!" shouted Miranda Thompson as she showed her class around the now-empty area.
Thompson, an art teacher who brought her class to the site, said the loss of the signage erases essential context.
"The true American history in this country is amazing, but it's amazing because of its diversity," she said. "If we don't understand our history, we're doomed to repeat it."