I have not visited the city, but hope to within the next month or two.

Here is a little info on the earth chakra of Krakow that I could find on the net though:

“Edging Kraków’s Old Town, Wawel Hill, with its castle and golden-dome cathedral, is extraordinarily atmospheric. Rumor holds a magic stone - some say a Hindu chakra stone - is buried somewhere on the hill. If rumors are true, its protective powers prevented Kraków from suffering any damage during World War II.” –

“Wawel is more than a centre of national importance. It is, so Hindu esoteric thinkers claim, one of the mystic energy centres of the world. Put simply chakra is a natural energy field found in every living being. According to chakra doctrine, there are seven chakra points on the body corresponding with seven chakra points of the planet. It just so happens one of those points is found in the north west corner of Wawel’s courtyard. To enjoy the powers of the chakra, believers stand with their heads, backs, hands and heels against the wall. Recently Wawel authorities have been doing their bit to discredit this energy rock mumbo-jumbo, and official tour guides are still forbidden to mention, discuss or admit its existence. Bah!” –