In one of the perhaps stranger sights to see in Trafalgar Square is the set of plaques installed to demonstrate the imperial units of measurement.
So if you're not sure how long a perch is, or a foot, or a link, head up to Trafalgar Square to have a peek at one of London's quirkier and most overlooked monuments.
Nearest stations:
UG: Charing Cross 0.06km
OG: London Charing Cross 0.23km
UG: Leicester Square 0.36km
Always check details regarding opening hours, accessibility and pricing before travelling.