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A novel approach which exploits the geometry of extra spacetime dimensions
has been recently proposed as a means to resolving the hierarchy problem.
Using physical pictures, I will describe two models of this type: one where
the apparent hierarchy is generated by a large volume for the extra dimensions,
and a second where the observed hierarchy is created by an exponential warp
factor which arises from a non-factorizable geometry. Both scenarios have
concrete and distinctive phenomenological tests. I will describe the classes
of collider signatures for both models and summarize the constraints on their
parameter space obtained from present collider and precision electroweak
data. In addition, if these theories truly describe the source of the
observed hierarchy, I will show that their signatures should appear at the LHC.
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