Many countries in the world are home to famous landmarks and monuments that attract millions of visitors each year. But some landmarks have areas inaccessible to the public - or anyone at all. These rooms might be a secret to most visitors, but they're usually not built for secretive reasons. These spaces have all sorts of purposes, from record keeping to providing a living space to recreation - or even no real purpose at all.
Some of these spaces may not be anything more than a glorified maintenance closet, but due to their proximity to a famous landmark, they're still the subject of fascination. Here are 12 secret rooms inside historical landmarks.