cave houses and monasteries carved into tufa rocks at zelve valley in cappadocia, turkey

abandoned air ancient architecture asia bryce byzantine canyon capadocia cappadocia cappadocian carved cave cavehouse chimney chimneys christianity church city cliff desert erosion fairy formation geology goreme hill history houses jordan kapadokya landscape monasteries monastery mountain mountains museum nature old open park petra red rock rocks rooms ruins sandstone season sky stone travel tufa turkey utah valley winter zelve