With a girth that rarely exceeds 15' Arborvitae makes a nice, narrow evergreen for tight spaces or to form a natural hedge or privacy screen.
 
It's practically insect and disease free, easy to grow and can live for hundreds of years.
 
Arborvitae serves as a larval host to several butterfly and moth species including the Promethea silkmoth.  Arborvitae also provides food and cover for birds, especially non-migrants looking for winter shelter. 
 
Arborvitae has soft needles that give off a sweet scent when squeezed and gnarly, reddish-brown bark.  Watch out for deer, though. They love this tree.
 
Fun fact: Arborvitae means “tree of life” because tea from the bark was used in the 1500s to prevent scurvy.