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Architecture Still in use Since 1970

Arcosanti and Arcology: Paolo Soleri's Unfinished City Up I-17

Arcosanti is the Valley's most ambitious unfinished building: a city for thousands, designed to replace sprawl, that has never housed more than about 150 people. Paolo Soleri started it in 1970 and paid for it with bells. The word he invented for it, arcology, went on to a second life in science fiction and SimCity.

Illustration for Arcosanti (and arcology): architecture

In one line

Arcosanti (and arcology): Arcosanti is the experimental town Paolo Soleri began building in 1970 above the Agua Fria River, about 70 miles north of Phoenix. Arcology, his 1969 word, means architecture and ecology fused: one dense, walkable structure in place of sprawl.

Also called arcology, Arcosanti Arizona, Soleri's city, Cordes Junction.

The 30-second version

  • Paolo Soleri coined 'arcology,' a blend of architecture and ecology, in 1969, the year he published the concept in a book subtitled The City in the Image of Man.
  • Ground was broken in 1970 in Yavapai County, about 70 miles north of Phoenix, on basalt cliffs above the Agua Fria River at roughly 3,700 feet.
  • The 1970 plan called for 1,500 residents, later raised to 5,000; the actual population has tended to run between 50 and 150.
  • Bronze bells cast on site, with tours and donations, have been the town's main income; the most recent building was finished in 1989.
  • The name joins arcology to Cosanti, the Paradise Valley studio where Soleri began earth-casting concrete in 1956.

Shelf

Architecture

Status

Still in use

In official or everyday use today.

On record since

1970

Who said it first

Paolo Soleri coined 'arcology' in 1969 and named Arcosanti by joining it to Cosanti, his Paradise Valley studio

What it means

Arcosanti is a cluster of concrete vaults, apses and round windows on a mesa edge above the Agua Fria River, about 70 miles north of Phoenix, and it is the most famous building project in Arizona that was never finished. Paolo Soleri, the Italian architect who came to the desert as a Frank Lloyd Wright apprentice, began it in 1970 as a prototype city. The plan called for thousands of residents in one compact, walkable structure. What stands is a fragment, home to a few dozen people at a time.

Arcology is the idea behind it, and the word is Soleri’s own: architecture plus ecology. An arcology stacks a city into a single dense structure so that nobody needs a car and the desert around it stays desert.

In Scottsdale you will hear Arcosanti as a day-trip suggestion and as the reason the bells exist. Soleri’s Cosanti studio in Paradise Valley cast and sold windbells for decades, and the bells paid for the city. The man’s full story is on the Paolo Soleri page.

Where you’ll meet it

On the drive to Sedona, on the day trips list, in the bell gallery at Cosanti, in the architecture guide, and, if you played SimCity 2000, on your monitor.

Where the word came from

Soleri coined arcology in 1969 as a portmanteau of architecture and ecology, and laid out the idea that year in a large book of drawings subtitled The City in the Image of Man. His argument was a direct reply to the suburb: low-density sprawl wastes land, energy and time, so build up and in instead of out. That put him on the opposite side from his old teacher. Frank Lloyd Wright’s Broadacre City spread families across the countryside an acre at a time; Soleri wanted thousands under one roof.

The place name followed the word. Arcosanti joins arcology to Cosanti, the name Soleri had given his Paradise Valley studio, itself built from the Italian cosa (thing) and anti. He broke ground in 1970 on land in Yavapai County at about 3,700 feet, near Cordes Junction. The first plan was for 1,500 residents, revised by the mid-1970s to 5,000.

Construction ran on volunteers and workshop students who paid to learn by building, and on money from bronze and ceramic bells cast on site. The most recent building was completed in 1989.

The word escaped. Arcologies became a fixture of science fiction, appearing in William Gibson’s 1984 Neuromancer as corporate tower-cities, and SimCity 2000 let players build them to save on roads. Few people who know the word from a game know it was invented for a mesa off I-17.

What it is not

Arcosanti is not Cosanti. Cosanti is the studio and foundry on Doubletree Ranch Road, twenty minutes from Old Town. Arcosanti is the town an hour and more north. Nor is it a commune or a ruin; it is a working, if much-reduced, foundation property with a gallery and tours.

The fine print

The numbers. The built town occupies about 25 acres inside a preserve of roughly 4,060 acres. Its population has tended to run between 50 and 150, many of them students and volunteers. In its active years it drew tens of thousands of visitors a year; the National Trust describes thousands still arriving annually.

The money. Bells remain the signature product and the historic engine of the place, alongside tour fees and donations. The same casting method, earth or sand molds and molten bronze, links the bells to the buildings.

The recognition. Soleri received a National Design Award for lifetime achievement in 2006, directed the master plan until his death in April 2013 at 93, and saw one public work built in Scottsdale: the Soleri Bridge and Plaza, dedicated on December 11, 2010.

The open question. The Cosanti Foundation, which owns both sites, has cut back its programs in recent years, and visiting schedules change. Call or check online before driving north. Whether Arcosanti grows, holds or becomes a monument is unresolved, which is fitting for a city that was always more argument than address.

The lexicon entries this one leans on.

Where you'll meet it on this site

The guides that carry the full story.

Arcosanti (and arcology) by the numbers

1970

Ground broken

About 70 miles

Distance from Phoenix

5,000

Planned population

50 to 150

Typical population

Questions people actually ask

What is an arcology?

It is Paolo Soleri's 1969 word for a city built as a single dense, three-dimensional structure, blending architecture and ecology. The goal was to put housing, work and culture within walking distance and leave the surrounding land wild. Arcosanti is the only attempt he built.

How far is Arcosanti from Scottsdale?

It is about 70 miles north of Phoenix, just off Interstate 17 near Cordes Junction, in Yavapai County. From Scottsdale plan on roughly an hour and a half each way, which makes it an easy stop on the way to Sedona or the Verde Valley.

Do people live at Arcosanti?

Yes, but not many. The population has tended to run between 50 and 150 people, many of them students, staff and volunteers. The plan was for thousands, and most of the city remains drawings.

What is the difference between Cosanti and Arcosanti?

Cosanti is Soleri's studio, home and bell foundry in Paradise Valley, begun in 1956 and about twenty minutes from Old Town. Arcosanti is the experimental town 70 miles north, begun in 1970 and partly paid for by Cosanti's bells.

Where this comes from

The record behind the entry.

Vernacular & LexiconYavapaiParadise ValleyDoubletree Ranch Road

Facts checked: October 2, 2026 • Curated by the Scottsdale.tips editors • Plain-English explainer. Usage changes faster than the record; corrections are welcome.

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