The Big Well is a large historic water well in Greensburg, Kansas, United States. Visitors enter the well for a fee, descending an illuminated stairway to the bottom of the well. It began construction in 1887 at a cost of $45,000 to provide water for the Santa Fe and Rock Island railroads and finished construction in 1888. It served as the municipal water supply until 19…The Big Well is a large historic water well in Greensburg, Kansas, United States. Visitors enter the well for a fee, descending an illuminated stairway to the bottom of the well. It began construction in 1887 at a cost of $45,000 to provide water for the Santa Fe and Rock Island railroads and finished construction in 1888. It served as the municipal water supply until 1932. It was designated a National Museum in 1972; in 1973 it was awarded an American Water Landmark by the American Water Works Association. Under the name of "Greensburg Well", it has been listed on the National Register of Historic Places since 1972. In 2008, the well was named one of the 8 Wonders of Kansas.