M.C. Escher prison

M.C. Escher prison

by Falsch von Fluctibus

Olde Mille

Olde Mille

by Daniel Newman (Quakerninja)

Tribute to Penrose and his Tribar

Tribute to Penrose and his Tribar

by Ricardo Baigorria

Cartoon with impossible stairs

Cartoon by Stefan Marx

Salute The Impossible

Salute The Impossible

by Steven Cihlar (essemcee)

Impossible ladder

Impossible ladder

by kellye_v

Parodies with Simpsons

Parodies on Escher's "Ascending and Descending" with Simpsons.

Alphabet RendeZvous

Alphabet by Tsuneo Taniuchi

Bloodfalls

Bloodfalls

by DarkWolf95

Ramps

Ramps

by Andreas Aronsson

Impossible fence

Impossible fence

by buda.

Infinite Learning logo

DJ Escher

DJ Escher

by David C. Lovelace

Zwali's Chain

Zwali's Chain

by Jeroen Zwaal (Zwali)

Art deco structure

Art deco structure

by Paul Fleet

Obstacle course

Obstacle course

by Dave Carpenter
http://im-possible.info/english/art/cartoons/dave-carpenter.html 
Author - http://www.carptoons.com/

Impossible parachute

Impossible parachute

by lukthree

Impossible triangle by Valentine Stepanitsky

Restaurant City

Screenshots from the online game Restaurant City.