Mutter Museum in Philadelphia, PA. It's a museum of medical oddities. They have many exhibits of conjoined twins... It's extremely disturbing.

This amazing water vortex sculpture made by William Pye is called Charybdis, and it is located in Seaham Hall, Sunderland, UK.

A sphere is a symmetrical geometrical object.
Thus, in three dimensions, a mathematical sphere is considered to be a two-dimensional spherical surface embedded in three-dimensional space, rather than the volume contained within it (which mathematicians would instead describe as a ball). The fixed point is called the center or centre, and is not part of the sphere itself.