Introducing the $1bn Harmony of the Seas, the world's biggest cruise liner that's longer than the Eiffel Tower

The world’s biggest cruise liner, Harmony of the Seas, sailed off from Saint-Nazaire in western France as part of a trial run today.

To be officially launched in May, the cruise ship is 362 m long, 66 m wide and will carry 5,479 passengers.

Built at a cost of $1.1bn, the vessel is taller than the Titanic and Eiffel Tower. It comes with 40 restaurants and over 2,000 crew members.

On its maiden voyage, the cruise ship will sail from Southampton to Barcelona.

Another trial will take place before the end of April.