Greece is mostly known for its islands, however Greece has all kinds of landscapes, therefore you can enjoy summer and winter holidays too. Islands are more popular in the summer season, but the mountainous areas have nothing to be jealous for, and offer just as good opportunities for the travellers. You just have to look for them! My personal next destinations are Meteora (monasteries built on extremely inaccessible, steep and remote mountains), very unique landscape and human effort to stay protected! Search for a drone video in youtube and you will see!