Nottingham Castle is a "disappointment" for tourists and should be demolished, a city leader says.
Councillor Ali Asghar, the current Sheriff of Nottingham, says a new castle should be built in its place.
A councillor for seven years, he told BBC News Online: "I think tourists who come to see the castle are probably very disappointed.
"It looks nothing like a castle and it is not what people expect.
"My personal view is... that the mansion should be knocked down and rebuilt as a proper castle, with some sort of theme park.
"As a council, I think it is possible that we are going to look into it."
The building overlooking Nottingham is not actually a castle at all.
The original castle was demolished in the 1600s after the execution of King Charles I.
A pink sandstone mansion now stands on Castle Rock where the original castle stood.
All that remains of the original castle is the grounds and part of the curtain walling.
The pink sandstone mansion was ruined by fire in 1831 but restored in the 1870s by local architect Thomas Chambers Hine and opened as a museum of fine art.
The building now acts as a museum and gallery, hosting various art shows which come to the city.
It is also the starting point for tours of underground caves.
1067: William the Conqueror erects a wooden castle on the rock
1170: Stone castle constructed by Henry II
1649: The castle is demolished after Charles I's execution
1663: The first duke of Newcastle constructs the palace seen today
1831: Rioters torch the building
1878: The mansion is restored and opened as the first municipal museum and art gallery outside London