Driving through central Pennsylvania on highway 99, near Altoona in the Sinking Valley, we discovered Fort Roberdeau, built in 1778 to protect lead mining, vital to patriot interests. Developed by Daniel Roberdeau, member of Congress and Pennsylvania selectman, the fort only remained open until 1780, due to difficulties maintaining it against attacks by British, Indians, and even nearby settlers. I was thrilled to visit it since I had read about Daniel Roberdeau's work to start the lead mine, and I was impressed with the construction as well as the tour and information offered by Rick and Karen. Visit Fort Roberdeau for a great experience learning about lead mining in the Revolutionary War; tour the grounds, and take a walk on the beautiful trails. I would recommend it!