Champions Online World Profile

The Champions Online official website offers another update, showing of the outline and concept art of the "Stronghold" location.
By the mid-1970s, supervillain crime was taking a vast toll on the American economy. Supervillians were stealing billions of dollars in cash and property each year, and destroying billions more. One reason was that it was difficult to keep superpowered villains incarcerated catch a few, and it would be only a matter of time before they busted out of prison or were freed by their cohorts.

In 1976, noted penologist Dr. Charles Wildman proposed Stronghold a super prison designed to hold supervillains.

Stronghold would be buried deep in an isolated New Mexico mesa. Its massive stone walls would be strong enough to withstand superpowers, but more importantly, the super-technology within the prison would block superhuman abilities and be capable of containing even the worst threats.

Soon all the states were sending their superpowered convicts to Stronghold, and with its power inhibitor technology, breakouts became a thing of the past. Supervillains were caught, convicted and served their sentences. The public was safe.