By John McDevitt

PHILADELPHIA (CBS) — Fundraising continues for a national museum that tells the story of the creation of America. Both the vision and a challenge were announced today on the future site of The American Revolution Center at 3rd and Chestnut Streets.

The museum will showcase things used in the fight for freedom, like General Washington’s sleeping tent, firearms and engraved powder horns–objects that give philanthropist and chairman of the American Revolution Center Gerry Lenfest chills.

“It does, but I think what gives me more chills are the lessons of the Revolution. You know, liberty requires responsibility, and I think we have to retell that story to every generation…to have responsibility, to make it continue,” Lenfest explains.

He also announced a $40 million challenge grant to encourage donations for the $115 million project. $80 million has been accounted for so far, he says, with $35 million to go.

“And I think that’s within our sights… we’re going to do it.”