Trees of all varieties blooming from underneath the earths crust encouraging humans to climb aboard and build houses in them because they are bigger than the SequoiaS. So big, humans can carve out tunnels and secret passageways within the trunks and the trees still lives. Def include at least one do the following types of trees: oak, weeping willow, ash, maple, aspen, palm, sequoia , cedar, pine, among others.