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This website devoted to miscellanea about Archimedes contains much interesting material about his life and times.

Images from Frans van Schooten's 1659 edition of The Geometry of Rene Descartes

Now there are three sisters who leave home together.
A survey of the attempts to prove Kepler's conjecture over the past 400 years.
Determine the greatest cylinder that can be inscribed in a given cone.
Prove that if the sums of the square opposite sides of any quadrilateral are equal, its diagonals interect at right angles.
This 1989 revision of the 1969 NCTM yearbook still provides wonderful suggestions for using the history of mathematics in the classroom.
A history of the various algebraic structures that came together to give us "abstract algebra" by early in the twentieth century.
What is the perpendicular height of a cloud when it's angles of elevation were 35 degrees and 64 degrees as taken by two observers?
The authors provide descriptions of Maya calendar systems, photos of artifacts, examples of calendar conversions, and exercises for classroom use.