Non-violent grass roots reform and Democracy: North American Wonders of The Ancient World

North America

Olmec Heads
The Olmecs carved about 300 colossal monuments including a lot of Heads and Alters weighing between 5 and over 50 tons. They transported them between 35 and 65 miles through the rain forests. The biggest Olmec cities were at San Lorenzo, Tres Zapotes and La Venta. source: "Seventy Wonders of the Ancient World" edited by Chris Scarre 1999

The colossal heads are made out of volcanic basalt which only weighs about 1.9 tons per cubic meter. The Rancho Cobata is approximately 24 cubic meters probably weighs about 45 tons. This may mean that The Seventy Wonders of the Ancient World may have over estimated the largest stone but not by much. There are few stones with this low a density.
http://www.latinamericanstudies.org/olmec-colossal-heads-1.htm
http://en.wikipedia.org/wiki/Olmec
http://www.micahwright.com/olmec/olmecs2.html
http://www.mnsu.edu/emuseum/prehistory/latinamerica/meso/cultures/olmec.html
http://www.delange.org/LaVenta/LaVenta.htm

Quirigua Guatemala
"The Maya somehow transported enormous stones through the jungle from distant quarries, apparently without the aid of either wheeled carts or beasts of burden. Artists then used only rudimentary stone tools to execute the intricate carvings, before raising the ponderous sculptures to their present vertical positions. Stele E at Quirigua weighs an astonishing 65 tons and stretches 10.5 meters in length, with sculptures covering its 8-meter panels." source: mayadiscovery.com

Stele D, Alter M and Zoomoorph B shown in the Wikipedia or delange.org site all appear to be at least 15 to 30 tons.
http://en.wikipedia.org/wiki/Quirigua
http://www.mayadiscovery.com/ing/archaeology/default.htm
http://whc.unesco.org/en/list/149

Chichen-Itza Mexico http://www.mnsu.edu/emuseum/archaeology/sites/meso_america/chichenitza.html
http://www.sacredsites.com/americas/mexico/chichen_itza.html

Teotihuacan Mexico
In addition to the pyramids of the sun and the moon there are about 600 pyramid like structures most of which have 3-5 levels and a flat platform. there are also many apartments found in the city. the original city was supposed to cover about 8 square miles. It was said by the Aztecs to have been surmounted by a huge stone figure related to the moon but this figure was uncovered (weighing 22 tonnes and was somehow lifted to the top of the pyramid) and it is thought more likely that it represents a water deity.

Source: Walker, Charles, 1980 "Wonders of the Ancient World"
http://en.wikipedia.org/wiki/Teotihuacan
http://www.sacredsites.com/americas/mexico/teotihuacan.html
http://archaeology.la.asu.edu/teo/

Tenochtitlan Mexico
The Aztec sun stone was located in the ruins. this stone is 4 meters in diameter and weighs over 20 tonnes. It was once located half way up the great pyramid. This stone calendar was made around 1470 CE under the rule of King Axayacatl, the predecessor of Montezuma. this calendar is said to tell the Aztec history and prophesy for the future.

source: Walker, Charles, 1980 "Wonders of the Ancient World"
http://www.mexicocity.com.mx/anc_city.html
http://en.wikipedia.org/wiki/Tenochtitl%C3%A1n
http://en.wikipedia.org/wiki/Fall_of_Tenochtitlan

Coatlinchan Mexico
A colossal statue over a thousand years old that was thought to represent Tlaloc was found in the town of Coatlinchan Mexico. This statue was made of Basalt and weighed an estimated 168 tons. It was moved to the National Museum of Anthropology in Mexico City in 1964 on a special trailer with dozens of rubber tires. This didn't happen until they promised the residents of the town to provide a large amount of public works. Some of the villagers still attempted to sabotage the vehicle but the secular authority prevailed in the end. The village people lined up to watch the statue as it passed by. Then there was a large unseasonable downpour. The downpour continued through the night. Many people may have interpreted this as a sign from the Gods. Some scholars believe that the statue may not have been Tlaloc at all but his sister or some other female deity. source: Time Life Lost Civilizations series:Aztecs: Reign of Blood and Splendor (1992) p.45-47
http://instructional1.calstatela.edu/bevans/Art446-03-Teotihuacan/WebPage-Info.00033.html
http://www.chapala.com/chapala/ojo2006/tlaloc.html
http://www.mexicolore.co.uk/index.php?one=azt&two=sto&tab=two&id=149
http://www.mercuryinretrograde.org/index.php?title=Mariana_Castillo_Deball

The Great Pyramid of Cholula Mexico http://en.wikipedia.org/wiki/Great_Pyramid_of_Cholula
http://www.delange.org/Cholula/Cholula.htm
http://www.geocities.com/atlantis01mx/puebla_tlaxcala/cholula.htm

Palenque Mexico
Pyramid: 60 meters wide 42.5 meters deep 27.2 meters high
Summit temple 25.5 meters wide 10.5 meters deep 11.4 meters high
Largest stones weigh 12 to 15 tons. These were on top of the Pyramid.
Total volume of pyramid and temple: 32,500 cu. meters
estimated labour: 125,000 person days

Source: "The Seventy Wonders of the Ancient World" edited by Chris Scarre 1999
http://www.sacredsites.com/americas/mexico/palenque.html
http://en.wikipedia.org/wiki/Palenque

El Tajin's Famous "Pyramid Of The Niches" Mexico http://www.delange.org/ElTajin/ElTajin.htm
http://en.wikipedia.org/wiki/El_Tajin