Tower of Victoria
From the Super Mario Wiki
In The Super Mario Bros. Super Show! episode "The Adventures of Sherlock Mario", Mario, Luigi, Toad and Princess Toadstool ventured to the Tower of Victoria to stop Professor Kooparity, Mouser, Tryclyde and a Koopa Troopa from stealing the Retro Router from the Tower of Victoria. Unfortunately, Mario, Luigi, Toad and Princess Toadstool ultimately failed to do so.
As mentioned above, the Tower of Victoria resembles a warped version of the Tower of London, with even the trees in front of the Tower of Victoria being bent and warped. Among the various objects inside the Tower of Victoria are suits of armor, a giant magnet and an equally large, swinging ax in it as well. The Retro Router was also originally located in the Tower of Victoria, behind a large, barred cell.