It was once one of the top 10 most endangered pieces of architecture in America. Today the only remaining hotel designed by Frank Lloyd Wright has been restored to its former glory and is open for business again.

The building in Mason City, Iowa, originally opened in 1910 to great fanfare. In the decades following, however, it housed stores, offices and apartments until by the 1970s it was little more than an empty shell.

A non-profit group bought the hotel from the city for just $1 (63p). Around $20m (£12.6m) has now been spent transforming the building back into a classic example of Prairie School architecture.

Hotel owner Steven Noto told the BBC about the painstaking restoration project.