  We show that there is a dual description of conformal blocks of $d=2$
rational CFT in terms of Hecke eigenfields and eigensheaves. In particular,
partition functions, conformal characters and lattice theta functions may be
reconstructed from the action of Hecke operators. This method can be applied
to: 1) rings of integers of Galois number fields equipped with the trace (or
anti-trace) form; 2) root lattices of affine Kac-Moody algebras and WZW-models;
3) minimal models of Belavin-Polyakov-Zamolodchikov and related $d=2$
spin-chain/lattice models; 4) vertex algebras of Leech and Niemeier lattices
and others. We also use the original Witten's idea to construct the
3-dimensional quantum gravity as the AdS/CFT-dual of $c=24$ Monster vertex
algebra of Frenkel-Lepowsky-Meurman. Concerning the geometric Langlands
duality, we use results of Beilinson-Drinfeld, Frenkel-Ben-Zvi,
Gukov-Kapustin-Witten and many others (cf. references).
