  Well-known results demonstrate the uniqueness of extremal isolated horizons
(equivalently near-horizon spacetimes) in (3+1)-dimensions. This paper briefly
reviews some of these results and then explicitly constructs families of
non-asymptotically flat, non-spherically symmetric spacetimes that nevertheless
contain spherically symmetric extremal horizons that are isomorphic to those
found in Reissner-Nordstrom spacetimes.
