Here’s a highly detailed secret door in a little used corner of a room. The handle makes the door visible, but it likely wouldn’t be obvious to a casual visitor.
This is the most minted gold bullion coin of all time, with over 42 million copies produced. South Africa started minting this in 1967 to market their gold reserves, decades before many other countries like the US, Canada and China started producing volume gold...
This secret compartment looks like it may have had sinister intentions. It’s a custom guitar with a hidden gun compartment made in Italy between 1930 and 1940.