A helter skelter is a funfair or amusement park ride with a slide built in a spiral around a high tower. Users climb up inside the tower and slide down the outside, usually on a mat or hessian sack. Typically the ride will be of wooden construction and, in the case of fairground versions, designed to be disassembled to facilitate transportation between sites. The term is primarily (but not exclusively) found in the UK. In the US, the ride is uncommon and may be called by other names, such as a "Skyslide".
(Courtesy of Wikipedia)
This particular helter skelter was situated in Cardiff Bay, Cardiff, Wales, United Kingdom.