Ohio has its own Spiritual site much like henges are in Britiania & it's called "The Great Serpent Mound" located in Athen County, Ohio down along the Ohio River.
Mound Building cultures such as the Adena, Hopewell & Fort Ancient Indian tribes were known to bury chieftans & important people in their mounds yet no one nor anything was found buried in the Great Serpent Mound. This is because it was believed to have been a center for a sacred site of worship & ritual.
Much like how the young couples who wish to increase their chances of fertility will sleep in the penis of the Cern Abbas Giant in Dorcestor, England, I believe that early mound builder couples who wished to conceive children would spend time making love inside the egg of the Great Serpent Mound.
The Great Serpent Mound is now part of the State of Ohio park system. It is protected & there even is a 3 story tower which you can climb to see the serpent.
In 1987 Clark and Marjorie Hardman published their finding that the oval-to-head area of the serpent is aligned to the summer solstice sunset. William F. Romain has suggested an array of lunar alignments based on the curves in the effigy's body. Fletcher and Cameron argued convincingly for the Serpent Mound's coils being aligned to the two solstice and two equinox events each year. If the Serpent Mound were designed to sight both solar and lunar arrays, it would be significant as the consolidation of astronomical knowledge into a single symbol.
If 1070 CE is accurate as the construction year, building the mound could theoretically have been influenced by two astronomical events: the light from the supernova that created the Crab Nebula in 1054, and the appearance of Halley's Comet in 1066. The supernova light would have been visible for two weeks after it first reached earth, even during the day. The Halley's Comet's tail has always appeared as a long, straight line and does not resemble the curves of the Serpent Mound. Halley's comet appears every 76 years. Numerous other supernovas may have occurred over the centuries that span the possible construction dates of the effigy. However spectacular, the light from the Crab Nebula would not have inspired the particular design of the Serpent Mound.
The Serpent Mound may have been designed in accord with the pattern of stars composing the constellation Draco. The star pattern of the constellation Draco fits with fair precision to the Serpent Mound, with the ancient Pole Star, Draconis-alpha, at its geographical center within the first of seven coils from the head. The fact that the body of Serpent Mound follows the pattern of Draco may support various theses. Putnam's 1865 refurbishment of the earthwork could have been correctly accomplished in that a comparison of Romain's or Fletcher and Cameron's maps from the 1980s show how the margins of the Serpent align with great accuracy to a large portion of Draconis. Some researchers date the earthwork to around 5,000 years ago, based on the position of the constellation Draco, through the backward motion of precessionary circle of the ecliptic when the star Thuban, also known as Alpha Draconis, was the Pole Star. Alignment of the effigy to the Pole Star at that position also shows how true north may have been found. This was not known until 1987 because lodestone and modern compasses give incorrect readings at the site.
Other Websites Regarding the Great Serpent Mound:
Crystal Links/Mound Builders of Ohio
Ohio History Central
 Clark and Marjorie Hardman, Ohio Archaeologist 37(3):34-40 (1987)
 Hamilton, Ross, The Mystery of the Serpent Mound, 2001