Chris Froome became the first Briton to win the Giro d'Italia in its 101-year history after a sensational comeback on Sunday.
The Team Sky rider's sixth Grand Tour title, following last year's fourth Tour de France win and maiden La Vuelta victory, sees him become the seventh man to have won all three races and just the third to hold the three titles simultaneously - after France's Bernard Hinault (1972/73) and Belgian Eddy Merckx (1982/83).
Froome finished ahead of defending champion Tom Dumoulin (Sunweb) of the Netherlands in the overall standings, with Colombian Miguel Angel Lopez (Astana) third.
Ireland's Sam Bennett (Bora) sprinted to victory in the 21st and final stage, his third of this year's race, after pipping four-stage winner Elia Viviani (Quick Step) at the line after a 115km closed circuit race through the streets of the Italian capital.
Froome said on Eurosport: "I don't think it has quite sunk in yet, but I'm sure it will over the next few days once I've had a bit of time to reflect.
"It has just been incredible. Obviously for any cyclist this is the dream. To have all three leaders' jerseys in the space of 10 months is just incredible, incredible feeling. I'm still pinching myself."