In 1808, Erik Jansson was born in Biskopskulla in Uppland. Later in his life he became the leader of a group of religious dissidents called the Janssonites. Due to persecution, 1500 Janssonite emigrated to the USA and in 1846 the Bishop Hill Colony was founded in Henry County, Illinois.
You can get more information about these happenings by following this multi-cache or by visiting one of the following websites:
Bishop Hill, Henry County, Illinois, USA
Bishop Hill Sällskapet
Bishop Hill Heritage Association
At the first place, with the coordinates above, you can find a lot of information about Bishop Hill and the Janssonites in the building.
Outside the door, there is a telephone number with six digits, ABCDEF
Go to North 59° 43,XXY - East 17° 11,XZC (where X=A*2, y=C+F and Z=B+F)
At the second place you will find an exhibition about one of the Janssonites.
How many hinges (Sw: gångjärn) are there on the side of the building facing the road? This is a two digit number, FG.
Go to North 59° 43,90H - East 17° 10, 90J (where H is half of FG and J is one third of H)
At the third place you will find a memorial. When was this memorial erected? This year is KLMN
Go to North 59° 43,PLQ - East 17° 11,RRR ( where P=K+M, Q=K+L divided by 2, and R=L-N)
At the fourth place you can find the cache which contains the usual GC logbook and nick-nacks.
That's a lot of mathematics, history and fun (we hope).