The Northeast Sanctuaries: A Guide to Lodgings in Monasteries, Abbeys, and Retreats of the United States, by Jack Kelly (TPB, 1991, $3)
"Today more and more people are choosing to spend their weekends and vacations in search of tranquillity and spiritual renewal. This state is often most easily discovered in the quiet and seclusion of a retreat that provides the time, space, and conditions for the mind and heart to come to stillness. In this, the first of their regional guides to the monasteries, abbeys, and retreats of the United States, seasoned travelers Jack and Marcia Kelly offer a choice of more than 300 places both religious and nonsectarian, where it is possible to find refuge, peace, and true refreshment."
When I was in college, and just discovering religion (at least as an adult), the Catholics held a midnight retreat at a local monastery. I remember walking for about two hours in the dark, the last hour in silence. We then had mass in the monastery chapel. That was more than 30 years ago, and I still remember the peace I felt then, and the closeness to God.
This book will help you have your own spiritual adventure. Look for it on the new non-fiction table, avail. 1/7. (Later: the travel section)