You do run the risk of 'old Russian church' overload here, so it pays to travel selectively. The most visited places are Sergiev Posad and Suzdal, but Vladimir and Bogolyubovo, Plyos, Kostroma, Yaroslavl, Rostov - Veliky and Pereslavl-Zaiessky, in their different ways, all have big attractions too. mos-tour.moscow/...lden_ring/