  We present a way to trap a single Rydberg atom, make it long-lived and
preserve an internal coherence over time scales reaching into the minute range.
We propose to trap using carefully designed electric fields, to inhibit the
spontaneous emission in a non resonant conducting structure and to maintain the
internal coherence through a tailoring of the atomic energies using an external
microwave field. We thoroughly identify and account for many causes of
imperfection in order to verify at each step the realism of our proposal.
