  High redshift galaxy clusters have traditionally been a fruitful place to
study galaxy evolution. I review various search strategies for finding clusters
at z > 1. Most efforts to date have concentrated on the environments of distant
AGN. I illustrate these with data on the cluster around 3C 324 (z=1.2) and
other, more distant systems, and discuss possibilities for future surveys with
large telescopes.

Astrophysics