At U.K. Parliament, Long-Forgotten Secret Passageway Is Discovered in a Wall

https://news.ycombinator.com/item?id=22421365

The door to the passageway was installed in 1950. It's not that long-forgotten, especially relative to the building it's in which is more than 1000 years old.

In the video they showed on the BBC the 'secret' door had a keyhole in the wooden panel, not exactly super secret.

This shouldn't have been overlooked by security officers.

What do you want them to do? X-ray the building?

It's only 70 years old, it should be on plans of the building or someone probably remembers it...

> it should be on plans of the building

But it wasn't.

> The team was at the Historic England Archive poring over some 10,000 uncatalogued documents relating to the palace when they found something interesting: plans for a doorway in the cloister behind Westminster Hall.

> Back at the palace, they found that tiny keyhole in the wood paneling — just where the plan suggested it would be.

The plans existed, were just uncatalogued.