This is a list of Stonehenge replicas and derivatives that seeks to collect all the non-ephemeral examples together. The fame of the prehistoric monument of Stonehenge in England has led to numerous efforts to recreate it, using a variety of different materials, around the world. Some have been carefully built as astronomically-aligned models whilst others have been examples of artistic expression and/or tourist attractions.
The only astronomically-aligned, full-scale, "exact" replica of (a pristine) Stonehenge in natural stone (granite) is at Esperance in Western Australia (esperancestonehenge.com.au). Some of the blocks weigh more than fifty tonnes and the replica cost over A$250 000 to build
The Maryhill Stonehenge: A full-size concrete replica of Stonehenge, as it would have been originally built, saw construction commence and was originally dedicated on July 4, 1918. Built in Maryhill, Washington by Sam Hill, it was the first monument in the United States to honor the dead of World War I (specifically, soldiers from Klickitat County, Washington who had died in the still on-going war). The altar stone is placed to be aligned with sunrise on the Summer Solstice. Hill, a Quakerpacifist, was mistakenly informed that the original Stonehenge had been used as a sacrificial site, and thus constructed the replica as a reminder that humanity is still being sacrificed to the god of war. The monument was originally located in the center of Maryhill, which later burned down leaving only the Stonehenge replica. A second formal dedication of the monument took place upon its completion on May 30, 1929. Sam Hill, who died in 1931, lived long enough to see his Stonehenge completed.
Foamhenge is a full-size, astronomically-aligned Stonehenge made out of foam near Natural Bridge, Virginia. "It is the only American Stonehenge that really is an exact replica of the time-worn original." "I went to great pains to shape each 'stone' to its original shape."
British Foamhenge; a full size, correctly aligned replica made from carpet tubes and polystyrene was constructed for a UK TV show entitled "Stonehenge Live" broadcast in June 2005. The positions of each stone were accurately plotted using RTK GPS, which has centimetric accuracy. The replica quickly became known as "Foamhenge". It was removed soon after filming, and the 'stones' remain in storage (January 2006).
A full-scale replica in sandstone was commenced in the rural township of Buckland in Tasmania in the first years of the 21st century (www.flickr.com/photos/ron-alenka/284418892/)but demolished by order of the municipal authorities. In keeping with the original Stonehenge, it did not have the necessary planning approval from the local council...
Mystical Horizons, located near Carbury, North Dakota, consists of six granite walls of varying heights that are intended to represent a 21st-century design. It functions as a working solar calendar. It was built in 2005.
Tankhenge existed in the border zone of Berlin in the early 1990s after the collapse of the Wall. Tankhenge was constructed from three ex-Soviet armoured personnel carriers.
Stonehenge microstructure; scientists from the National University of Singapore created the smallest 3D replica of Stonehenge. Measuring only 80 micrometres in diameter, the Stonehenge microstructure was created by a process called silicon micromachining which uses a high-energy proton beam writer to produce 3-D microshapes and structures of high structural accuracy on the surface of materials such as silicon.
Fridgehenge; another modern take on Stonehenge once existed outside of Santa Fe, New Mexico, constructed out of junked refrigerators, known as 'Fridgehenge'. The site was created by the artist Adam Jonas Horowitz. The site no longer exists, all fridges have been removed after a complaint, confirmed on 5 August 2008.
In 2012 British artist Jeremy Deller created a life-size inflatable bouncy castle- style replica of Stonehenge titled 'Sacrilege' which first appeared in Greenwich Park, London and other parks in the capital; the interactive artwork has since toured nationally and internationally. 
Snowhenge - Standing 6.5 feet (2.0 m) tall and 30 feet (9.1 m) in diameter, consisting of nearly 1,000 cubic feet (28 m3) of packed snow.
The rock band Black Sabbath featured a Stonehenge stage set for the 1983-1984 Born Again tour that ended up being too large to fit in most venues. This was parodied in the movie This is Spinal Tap, when the band orders a Stonehenge set but it arrives in miniature due to a confusion between feet and inches. There was also a Chicago based heavy metal band named Stonehenge that actually owned the trademark to the name. Stonehenge met with underground success in the 1990s and 2000s performing with acts such as Pantera, Iced Earth, Trouble and Manowar.
In February 2010, Peter Salisbury, founder of the Michigan DRUIDS, created a 1/3 scale replica of Stonehenge at the MacKay Jaycees Family Park in Grand Rapids, Michigan appropriately named Snowhenge.
Comparable archaeological sites
Aside from modern replicas, several other archaeological sites have had Stonehenge's name partially or fully incorporated into their own names. America's Stonehenge is an unusual and controversial site in New Hampshire. A henge near Stonehenge containing concentric rings of postholes for standing timbers, discovered in 1922, was named Woodhenge by its excavators because of similarities with Stonehenge. The name Woodhenge is also used for the American site of Cahokia. The timber Seahenge in Norfolk was named as such by journalists writing about its discovery in 1998.
In November 2004, a 7 m diameter circle of postholes was found in Russia and publicised as the Russian Stonehenge. Other prehistoric sites elsewhere, often also with proposed astronomical alignments, are often described by journalists as being that region's '"answer to Stonehenge".
Box Tunnel, a railway tunnel in England allegedly design so the sun would shine through it on the engineer's birthday.
Manhattanhenge; in New York City, due to the street grid's skew of about 28.9° and the strict grid plan on most of the Manhattan isle, the sunset is aligned with the street grid lines in May and July, as well as the sunrise in December and January. This phenomenon is known as Manhattanhenge.