Today is the feast day of St. Markella of Chios. I have made pilgrimage to this site on the island where my grandmother was born.
http://www.e-xios.gr/chios/5/53.htmlI have seen that the split rock in the sea where the earth opened up to hide her is indeed still blood stained. According to legend,her head gave off light and was spotted by an Italian ship that was passing, and brought to Italy where it can still be venerated. St. Markella is known in Italy as St. Marcella.
*********************************************************************************************************
**********************************************************************************************************
Here are some interesting stories accounts given:
More recently (July 1992), an eye witness, the Rev. Nicholas Makris, related the following incidents concerning the Saint’s miraculous presence:
a) During a pilgrimage to the shrine, as the priest began to read the Gospel over the waters of Marcella’ s demise, the sea began to steam and the water lost its salty taste.
b) During Holy Liturgy at the Saint Marcella Church, as the priest spoke the words, "By having respect for God...," a Greek - American girl entered the church and called out in the presence of the people, "Father, listen to what just happened to me." But before she began her story, her gaze fell on the icon to the right of the iconostas which pictured the bloodied head of Aghia Marcella floating on the waves. The girl shouted. "There, that’s the girl I saw." And she related the incident. "My parents and I were walking towards the site of the Saint’s waters. Along the way, at the spot where the cross stands (the place where she was wounded by the arrow), I saw a woman dressed in black selling children’ s toys. I said to my parents. "Isn’t the girl here too early for the festival?" But my parents, could not see her. We walked further on, and on my way back, on the same spot by the cross, I saw the black-clad girl. "There she is" I cried out. The girl raised her hand, waved to me, and disappeared."
c) One day a thick branch broke off one of the eucalyptus trees in the church courtyard. On the spot of the break the face of a girl appeared with a halo around her hair. It was concluded that the face was that of the Saint. In addition to the above witnessed events the church is filled with countless votive offerings by the faithful who were cured of various afflictions and who are undeniable witnesses to the miracles of Saint Marcella.
Crowds of people from all parts of Greece gather at her holy shrine to receive its beneficent gifts. There are a good number of guest rooms in the courtyard, as well as convenient areas for camping and parking of cars.
http://www.chiosonline.gr/aghiamarcella.asp 
