I'm not sure if I'd rank it as the best part of Cappadocia, but the Fairy Chimneys are definitely the most unique and spectacular part. These formations are representative of the region and being there is an unforgettable experience. The "peribacalar" (Fairy Chimneys) were formed by the erosion of the layer of limestone covering the volcanic rock. This left them in spindly formations which are now called "chimneys." Some of them are over 40meters high! They're cone-shaped and are crowned by tufts of hard stone standing over the pale pillars. Depending on how you look at them (and your mindset) they either look like massive phalluses or bizarre mushrooms. Locally, they're known as "kalelar" ("castles," in Turkish). In Cappadocia, you can see these formations and many others (near Zelve, there's a mountain of rocks in the shape of giant breasts).