Rocks.

Druid_Arch._Needles_District.Canyonlands_UT.(9862534466).jpg

Islallana-DSC09150.jpg

Meteora`s_monastery_2b.jpg

As a forester I've had to burn out a lot of tree stumps in my day. They're too big to dig out by hand, although I used to do it that way when I was young & strong & stupid. This is a close-up of 'Meteora`s_monastery_2.jpg', above.