 Harrison was also involved in the building of a series of monuments . His first commission was to design the Jubilee Tower on the summit of Moel Famau , the highest point of the Clwydian Range in North Wales , to celebrate the Golden Jubilee of George III in 1810 . This consisted of an obelisk in two stages on a broad base . The obelisk collapsed in 1862 , and the base was remodelled in 1970 to make a viewing platform . The design of Lord Hill 's Column in Shrewsbury , Shropshire , has been attributed to Harrison , but this is incorrect . The architect was Edward Haycock , but Harrison did make alterations to the design , changing the style of the column , and adding a pedestal with statues of lions ; and Harrison did supervise the construction . Harrison designed The Marquess of Anglesey 's Column in Llanfairpwll on Anglesey to commemorate the feats of Henry Paget , 1st Marquess of Anglesey . This was constructed in 1816 – 17 at a cost of nearly £ 2 @,@ 000 ( equivalent to £ 130 @,@ 000 in 2015 ) . His last memorial was a ceremonial gateway at Holyhead , also on Anglesey , to commemorate the landing there of George IV in 1821 . It consists of an archway with Doric columns , and cost £ 600 ( equivalent to £ 38 @,@ 000 in 2015 ) , and was opened in 1824 . 
