Jantar Mantar

http://commons.wikimedia.org/wiki/File:Jantar_Mantar_at_Jaipur.jpg

Timex had nothing on Jai Singh II. After building this 90-foot sundial, the Indian maharaja always knew the correct time to within half a second — and this was in the early 1700s.

Ben Franklin wrote, “Energy and persistence conquer all things.”