Below are possible answers for the crossword clue See 18.
a room or building equipped with one or more toilets
the last of the four Gospels in the New Testament
a prostitute's customer
(New Testament) disciple of Jesus; traditionally said to be the author of the 4th Gospel and three epistles and the book of Revelation
youngest son of Henry II; King of England from 1199 to 1216; succeeded to the throne on the death of his brother Richard I; lost his French possessions; in 1215 John was compelled by the barons to sign the Magna Carta (1167-1216)
Nicaraguan statesman (born in 1945)
make a long and difficult journey; "They trekked towards the North Pole with sleds and skis"
journey on foot, especially in the mountains; "We spent the summer trekking in the foothills of the Himalayas"
any long and difficult trip
a journey by ox wagon (especially an organized migration by a group of settlers)
a device or control that is very useful for a particular job
something unspecified whose name is either forgotten or not known; "she eased the ball-shaped doodad back into its socket"; "there may be some great new gizmo around the corner that you will want to use"
Other crossword clues with similar answers to 'See 18'