A few years ago I saw a photo of a cemetery covered in lit lanterns. This was my introduction to the celebration of All Saints Day in Poland. Much like the Day of the Dead celebration in Mexico, All Saints Day is celebrated on November 1st and 2nd when it is believed the souls of the dead come back to visit. In Poland, lanterns are lit to guide the dead back and graves are covered in flowers and evergreen branches. In more rural areas, a special bread is baked and vodka is left for the dead to drink.
Although celebrated as a Catholic tradition these days, I've read that All Saints Day or All Souls Day has pagan roots in a tradition called Dziady. Dziady was a feast celebrating the dead held in the spring and fall.
The photos I've seen are incredibly beautiful. Check out Google images, you'll be in awe.
Visit Domitp to purchase some of these beautiful cemetery lanterns called Znicze.