Net browsers can now snoop around Buckingham Palace thanks to online magazine Royal Insight.
The virtual tour has been created to encourage people to take the official tour when the Palace is opened on Sunday.
Photographic virtual reality company Panormania, which created the tour, also produced the virtual tour of No 10 Downing Street.
Jamie Mitchell, of Panormania, said: "The Royal Family has a global following but not everybody can go and look inside Buckingham Palace.
"There were certain features that were important to present - not just the room but certain objects like the secret door - which are very interesting to the general public."
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