St Nicholas Church is one of Leicester's oldest surviving buildings, standing beside the Roman Jewry Wall and carrying bits of the city's long history in its fabric. The church has Saxon and Norman layers, later medieval work, and the slightly patched-together quality that old English churches often wear well.
It is worth a look because of its setting as much as its interior. Pair it with the Jewry Wall Museum area and the lanes around the cathedral to get a compact walk through Roman, medieval, and modern Leicester.