There's essentially a whole city buried underneath London, with passages and tunnels connecting almost every part of the capital.
Deserted stations, secret tunnels, and eerie platforms are a source of curiosity and fascination.
For the average commuter traveling across the city in sunshine, snow, or storms, the London Underground is a lifesaver.
However, some important people receive special treatment on the Tube.
An unmarked passage allows the country's leaders to move from Westminster Underground station all the way to parliament without ever going outside or encountering the regular people outside.
Only individuals with a parliamentary pass – MPs, Lords, civil servants, and Palace of Westminster staff – are permitted to use this special route.
There are no signs or armed guards marking the entrance to the underpass that leads to Portcullis House, which was only installed in 2019.
This caused controversy at the time, as it came just months after a homeless man, 43-year-old Gyula Remes, passed away in the sheltered spot frequently used by rough sleepers.
According to reports, MPs expressed displeasure at having to walk through the 'stench' of some of the poorest and most vulnerable individuals in society on their way to the centers of power.
This led to allegations that lawmakers were not addressing the growing issue of homelessness adequately, MailOnline reported.
Greg Beales, from the homelessness campaign Shelter, stated that the crisis would be resolved 'not with barriers but by providing the support and assistance we know can help people to access a safe and stable home'.
A recent video by London tour guide Bowl of Chalk demonstrated how to find the hidden passage.
You can locate the four-foot barrier by turning left when you exit the main ticket hall, rather than going up the stairs to Parliament Square.
On your first right, you'll come across the unmarked gate that leads to Portcullis House and the Palace of Westminster.
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