Everything about Kryptos is interesting. If you have any interest at all in cryptography it’s worth knowing about Kryptos.

OBKR
UOXOGHULBSOLIFBBWFLRVQQPRNGKSSO
TWTQSJQSSEKZZWATJKLUDIAWINFBNYP
VTTMZFPKWGDKZXTJCDIGKUHUAUEKCAR

The only official known plaintext in the above last section of Kryptos is that NYPVTT=BERLIN.

Lots of good information on Kryptos here.