Today and every Bright Friday the Holy Church celebrates the Lifegiving Spring of the Theotokos. Please read the interesting story about this spring and the many churches that were built over it and destroyed over history at the links below.

English:

http://oca.org/saints/lives/2015/04/17/ ... her-of-god

Russian:

http://www.patriarchia.ru/db/text/613717.html