The Most Secure Vault in the World? 7 Famous Vaults Compared

Nobody publishes a league table of vault security, and the places that guard the most gold are the ones that say the least. So we’ve compared what they do publish: depth, doors, contents and who gets in. Here are seven famous vaults, side by side.

So which is the most secure vault in the world?

The honest answer is that nobody outside these institutions can say. Central banks and governments publish very little about alarms, guards or procedures, and you can hardly blame them. The U.S. Mint, for example, says only that the structure and contents of Fort Knox are “known by only a few”.¹ Lists that rank vaults by biometric scanners, laser grids or minefields are filling the gap with guesswork.

What can be compared is the published record: how deep the vault is, what guards the door, what it holds, whether outsiders are ever let in, and whether it has ever been robbed. On that record, Fort Knox is the most closed, the New York Fed is the largest store of gold, and the Bank of Spain has the most theatrical defence. We found no record of a successful break-in at any of the seven vaults below. If you’d like to know how a vault differs from a safe in the first place, see our guide to vaults and safes.

The world’s most famous vaults compared

Figures are the institutions’ own unless marked otherwise; the footnote after each vault gives the source. “Not published” means exactly that: we found no official figure, and we haven’t been tempted to fill the gap with estimates.

Depth and doors

Contents and visitors

Fort Knox: the vault nobody visits

The United States Bullion Depository at Fort Knox, Kentucky, was finished in December 1936 at a cost of $560,000. The Mint’s shopping list for it ran to 16,000 cubic feet of granite, 4,200 cubic yards of concrete, 750 tons of reinforcing steel and 670 tons of structural steel. The first gold arrived on 13 January 1937, from the Philadelphia Mint and the New York Assay Office.¹ That December the Hamilton Journal-News credited the vaults to the Mosler Safe Company of Hamilton, Ohio; we haven’t found a Mint record naming the maker.⁹

Today it holds 147.3 million troy ounces, about half of the Treasury’s stored gold, booked at the old official price of $42.22 an ounce. Its peak was 649.6 million ounces at the end of 1941. During the Second World War it also sheltered the Declaration of Independence, the Constitution and the Bill of Rights, returned to Washington in 1944.¹ Earlier Mint fact sheets add the Articles of Confederation, the Gettysburg Address and a Gutenberg Bible to that list.¹⁰

What makes Fort Knox stand out is secrecy, not any published gadget. “No visitors are permitted,” the Mint says, and it adds that “no one person knows all the procedures to open the vault”. Before 1974 the only outsider who had been inside was President Franklin D. Roosevelt. The vault was opened to journalists and a Congressional delegation on 23 September 1974, when rumours persisted that the gold had gone, and again for Treasury Secretary Steven Mnuchin and Kentucky’s governor on 24 August 2017.¹ The door is widely quoted at about 20 tons (see our history of bank vault doors), but the Mint itself doesn’t publish its weight, and we found no official source for the minefields and anti-aircraft guns that turn up on so many lists.

The New York Fed: the biggest store of gold

The gold vault of the Federal Reserve Bank of New York was built with the bank’s headquarters in the early 1920s. It rests on Manhattan’s bedrock, 80 feet below street level and 50 feet below sea level. Its only entrance is guarded by a 90-ton steel cylinder that turns within a 140-ton steel-and-concrete frame.² The Bank of Spain says its own armoured doors came from the same maker that equipped the New York Fed: York Safe & Lock Co. of Pennsylvania.⁵

As of 2024 the vault held about 507,000 gold bars weighing 6,331 metric tons, and at its peak it contained over 12,000 tons. The bank is really just the landlord. None of it belongs to the New York Fed or the Federal Reserve: the account holders are the US government, foreign governments, other central banks and official international organisations.²

Unusually for a vault of this size, the public can see it. Visitors can register for a free tour of the bank, and school groups may be shown the gold vault, subject to availability.²

Bank of England: nine vaults under the City

The Bank of England keeps about 400,000 gold bars, worth more than £200 billion, in nine underground vaults. Almost none of it is the Bank’s own: it says it owns just two bars, and stores the rest for the UK government, banks and other governments.³

The present vaults date from Herbert Baker’s rebuilding of the Bank between 1925 and 1939, when the site was excavated several levels below ground. The work was done in phases so the Bank could keep trading, and the gold was moved from the old vaults to the new ones as each was completed.¹¹ Journalists shown round in 2012 came back with two details worth repeating: keys about three feet long, and a former staff canteen now used to store gold.¹²

Visits to the vaults are rare. The nearest most people get is the Bank of England Museum, where you can lift a real gold bar.³

Banque de France: La Souterraine

Under its head office in the Hôtel de Toulouse in Paris, the Banque de France keeps a vault of about one hectare, 27 metres below ground, known as La Souterraine. It has held France’s gold since 1927 and today holds 2,436.8 tonnes.⁴ Few vaults have been more influential: the architect of the Bank of Spain’s vault had seen it at first hand and used it as his model.¹³ Madrid, in other words, owes something to Paris.

Bank of Spain: depth, American doors and a flood trap

Many searches for the “most secure vault in the world” are really about Madrid, and television has a lot to do with that. The Bank of Spain’s Cámara del Oro lies 35 metres below Plaza de Cibeles. It was designed in 1932 and finished in March 1936, not built with the 1891 building as many sites claim.¹³ Its armoured doors, some over 14 tonnes, came from York Safe & Lock Co. in Pennsylvania.⁵

The famous flood trap is real, but it doesn’t work the way it does in Money Heist: it floods the shaft in front of the entrance, not the vault, and it’s never been used.¹⁴ We tell the full story, from Moscow gold to the film sets, in our history of the Bank of Spain’s gold vault.

Svalbard Global Seed Vault: guarded by permafrost

This one guards seeds, not gold. The seed vault on Spitsbergen opened on 26 February 2008. Its storage halls lie more than 100 metres inside the mountain, under 40 to 60 metres of rock. Each of the three halls can take about 1.5 million seed samples, a total capacity of 4.5 million, and cooling keeps them at minus 18°C. If the cooling ever failed, the permafrost would take over: at minus 3 to 4°C, it would keep the seeds frozen for a long time.⁶ By October 2026 it held more than 1.4 million samples.¹⁵

Its security is as much legal as physical. Seeds are deposited free under “black box” conditions: the boxes are never opened, and only the gene bank that sent them can ask for them back.¹⁶ The first withdrawal came in 2015, when the research centre ICARDA asked for seeds to replace a gene bank near Aleppo damaged in the Syrian war.¹⁷

It isn’t invulnerable, though. In 2017 The Guardian reported meltwater running into the entrance tunnel after an unusually warm winter, although it didn’t reach the seeds.¹⁸ Norway carried out a major upgrade between 2016 and 2019, making the entrance tunnel waterproof and installing a new cooling system.¹⁶ It also earns a place among the strangest vaults in the world, next to a cola recipe behind a hand scanner.

Granite Mountain Records Vault: records in the rock

In Little Cottonwood Canyon near Salt Lake City, the Church of Jesus Christ of Latter-day Saints keeps its master microfilms in tunnels cut into granite. The Church dates the vault to 1965; the Deseret News gives the fuller story: blasting began in May 1960, the first microfilm arrived in April 1963, and the vault was dedicated on 22 June 1966. Around 675 feet of granite lie over the tunnels, and the entrance doors, weighing 9 to 14 tons, were said to be able to withstand a nuclear blast.⁸

The vault safeguards more than 3.5 billion images on microfilm, microfiche and digital media. So don’t plan a visit: for security reasons there’s no public access.⁷

Often on these lists, but not bank vaults

Many “most secure vault” lists pad themselves out with places that aren’t vaults at all, or about which nothing reliable is published. Three come up again and again.

What actually makes a vault secure

Strip away the speculation and the same few ideas run through all seven vaults. None of them depends on a single clever device. It comes down to rock, weight, paperwork and keeping quiet. (For the parts of an everyday bank vault, see how bank vaults work.)

• Depth and rock. Bedrock under Manhattan, wet clay 35 metres under Madrid, permafrost on Svalbard, granite in Utah. Earth is cheap armour, and the Bank of Spain’s architect chose depth partly for fear of air raids.¹³
• Mass at the one way in. The New York Fed’s single entrance is a turning cylinder of 90 tons; the Bank of Spain adds a floodable moat and a bridge for one person at a time.²¹⁴
• Divided knowledge. At Fort Knox no one person knows all the procedures to open the vault, so no single insider can be bribed or forced.¹ Time locks and split combinations, developed in the 19th century, serve the same purpose; see our history of safe lock mechanisms.
• Records and audits. The Bank of England keeps detailed records of every bar and its owner.³ A theft that cannot be hidden is far less attractive.
• Silence. Every institution here publishes less than journalists would like. That is a feature, not an oversight.

Real attacks have usually gone after much easier targets than these: safe deposit centres, bank branches and cash depots, often with inside help. For the cases that went wrong for the robbers, see our failed bank robberies, and for the tools they used, our history of safe-cracking. For single safes with a story, from the Titanic to Al Capone’s hotel, see our famous safes.

Myths about the world’s most secure vaults

The coal-mine story is explained on the seed vault’s own history page.²²

Frequently asked questions