Credit: Mulchaey et al (ST Sci/UMD/NASA)
VRML, which stands for "Virtual Reality Modeling
Language", is a
significant, although still somewhat immature, attempt at providing full
3D
interactive graphics on the Web. This technology allows you to create
static or animated 3D models that let you move about the scene, view it
from many different angles and distances, enter inside objects, and
control the
direction of lighting and cameras.
See
this for a full discussion and many examples of VRML capabilities.