The Ventooz is is a concept designed for Imagineactive.org based on Disney's wall climbing robot, Vertigo. The principle is similar only scaled up in size:
The vehicle features suction cup covered wheels and four powerful fans that can point in any direction and propel the vehicle downwards, enabling it to stick to walls.
Just strap on the 4 point harness and up you go.
(Mandatory titanium balls not included)
Ventooz Wall Climber