What is on the back of each US coin?

Dollar - the Statue of Liberty (Presidential dollars), an eagle (Sacajawea, 2000-2008), various Native American themes (2009-)

Half dollar: an eagle

Quarter: eagle, state symbols, or national monuments

Dime: torch, oak leaf, olive branch

Nickel: Monticello

Penny: Lincoln Memorial (up to 2008), Lincoln commemorative images (2009), Union shield (2010-)