A Walk Through Time proudly brought to you by the NIST Physics Laboratory. This site is neat. It shows the progression of time measurement throughout the ages. From the earliest calendars to the first simple time keeping devices.
I think my favorite section was the Earliest Clocks. You can learn about sun clocks and water clocks. Egyptian Shadow Clocks RULE!
This site has an excellent progression and is interesting to read—not dry like a textbook. I think our cultures have been fascinated with time and will continue to be, so what are you waiting for? check it out!