The Celebrity Silhouette cruise ship

Launched in July 2011, this luxurious ship cost about $900 million to build and features state-of-the-art innovations including hireable cabanas decked out with picnic hampers, iPads loaded with music, movies, games and magazines and glass elevators that zoom up and down the central atrium around a live tree suspended in mid-air.

The Celebrity Silhouette. Photo / Supplied

Image 1 of 6: The Celebrity Silhouette. Photo / Supplied