These maps have Blarney Stones in ends of the parkour. If you kiss there, you will get the stones themselves. However, you can only kiss at each BLARNEY map per 24 hours(1 day). Because of that, @Seth and @Hamumu lowered the max people allowed in the world to reduce lag.
There are the maps:
Blarney1, Blarney01 & Blarney001 by @Hamumu
Blarney2, Blarney02 & Blarney002 by @Hamumu
Blarney3, Blarney03 & Blarney003 by @Hamumu
Blarney4, Blarney04 & Blarney004 by @STYX
Blarney5, Blarney05 & Blarney005 by @AtomicShadow
Blarney6, Blarney06 & Blarney006 by @Play
Blarney7, Blarney07 & Blarney007 by @AtomicShadow
Blarney8, Blarney08 & Blarney008 by @Redbone
Some mods come to those maps. You can see them if you are fortunate.