You have some very nice photos there. I don't know why, but I like the second shot the best. It looks like the inside of a monastery. I am Greek-American, what part of Greece did you go?
They are all horrible. I guess you'll have to go back and try again... j/k I usually like to see higher contrast especially in b&w's but I like them. That would be my only critique. I like the composition and the conversion to b&w.