भोजपुर (महाभारत का एक ऐतिहासिक स्थल) Bhojpur (A site of Historical interest)

West of Bhojpur once lay a vast lake, but nothing remains except the ruins of magnificent old dams by which its waters were contained. The site was chosen with great skill, as a natural wall of hills enclosed the whole area except for two gaps, 100 yards and 500 yards in width respectively. These were closed by gigantic earthern dams, faced on both sides with enormous blocks of sandstone, many being 4 feet long, 4 feet broad and 2.5 feet thick, set without mortar. The smaller dam is 44 feet high and 300feet thick at the base, the larger dam 24 feet high with a flat top 100 feet broad. These embankments held up and expanse of water of about 250 square miles. This great work is ascribed to Raja Bhoj, but it may possibly be of an earlier date.
An old and very famous Shiva temple having largest Shivalinga above ground is here.
More about Raja Bhoj and his legacy -

en.wikipedia.org/wiki/Bhoj
en.wikipedia.org/wiki/Samarangana-sutradhara