In 1989 Dr. Robert Vande Kappelle cycled solo cross-country. The 3,400-mile trip was the seed project for the Washington County (Pennsylvania) chapter of Habitat for Humanity. For forty-two days he went Homeless for Habitat, placing himself and his personal needs in the hands of strangers he met along the way. At the beginning he cycled across some of the most mountainous–and spectacular–terrain in America. After he crossed the Rockies, a nagging headwind arose, which only intensified with time. That, coupled with a deteriorating bicycle–along one of the most desolate stretches of the journey–produced spiritual testing of epic proportions. He was tempted to compromise the integrity of the trek, then to quit the trek, and finally to curse his circumstances. He sensed he was climbing an invisible mountain, whose top could not be reached. After venting his anger and frustration, he discerned that tailwinds and flat terrain rarely evoke wisdom. Insight flows freely, however, from the watershed atop life’s invisible mountains. The Invisible Mountain narrates the account of that trek. The story examines the trek as adventure, spiritual odyssey, and as metaphor for the journey of life. In the words of Millard Fuller, co-founder of Habitat for Humanity International and The Fuller Center for Housing: Ride with [Bob Vande Kappelle] as you read. You will enjoy the trip and you will gain all sorts of insights … and perhaps most importantly, you will learn about yourself and grow spiritually as you experience vicariously the wonderful adventure of this ‘journey of faith.