The exclusion zone around the Chernobyl nuclear disaster site has only limited access to visitors, and is prohibited as a place to live. Picture: AFP/Viktor Drachev. Source: AFP TRAVELLING the world has never been so easy. But there are still many hidden secrets that are far from being unlocked for regular travellers. What does Queen Elizabeth's bedroom look like? Exactly where is the Swiss Fort Knox? What does it feel like to sit inside Al Qaeda headquarters in the Tora Bora caves, Afghanistan? In his new book, 100 Places You Will Never Visit , UK author Daniel Smith has pulled together just that: destinations that are so hard to reach, so closely guarded or so secret that they are almost impossible to get to. Billed as an anti-travel guide, the book includes pictures and descriptions of the world's most secret places, from vast data centres and secure vaults, to the headquarters of international spies and dangerous war zones.