NEW YORK – With its huge reflecting pools, ringed by waterfalls and skyscrapers, and a cavernous underground museum still under construction, the National Sept. 11 Memorial and Museum at the World Trade Center is an awesome spectacle that moved and inspired some 4.5 million visitors in its first year.

But all that eye-welling magnificence comes with a jaw-dropping price tag. The foundation that runs the memorial estimates that once the roughly $700 million project is complete, the memorial and museum will together cost $60 million a year to operate.

The anticipated cost has bothered some critics and raised concerns even among the memorial's allies that the budget may be unsustainable without a hefty government subsidy.