Holy Mountain Grabarka is situated near town of Siemiatycze in northeastern Poland. In XVIII century there was a man marvellously healed from cholera after he had put a cross on the top of the Mountain. Since then people have been carrying crosses and leaving them there, now there are thousands of them. In 1947 there was female a monastery of St. Martha and St. Mary set up.
Annually on the feast of Transfiguration (by Julian) about a dozen of thousand pilgrims gather there. Many of them on foot, even from such remote places as Białystok and Warsaw (about 200 km). It's the most known and the biggest feast in Poland. There is also a copy of Icon of Theothokos from Iverion given by Athonite monks. On May there is also a gathering of Polish Orthodox Youth.
The place was visited by many primates of Churches and hierarchs:
- Patriarch Bartholomew I of Constantinople
- blessed memory Patriarch Peter VII of Alexandria
- Patriarch Cyrill of Russia (as Metropolitan)
- Patriarch Teoktist of Romania
- blessed memory Archbishop Chrystodulos of Athens
- Metropolitan Herman of America
and Hierachs from Serbia, Ukraine, and Hungary
Here you've got a photoreport from 2003: http://cerkiew.pl/index.php?id=fotoreportaze&tx_ttnews
You have to paste the whole url.