Floating cities [cruise ships]

For modern cruise companies innovation has been a steady progression. Back in 1970, Song of Norway, Royal Caribbean's first ship, which weighed in at a relatively paltry 23,000 tonnes, had a gym in an empty cabin that consisted of a rowing machine and a treadmill. Not many people used the gym or made any effort to find it. Today, Royal Caribbean's newest ships feature the largest fitness centres and spas at sea, overlooking the vast expanses of the oceans, ports and global destinations the cruise line visits. Pools that were once inside the ship and on the lowest level have evolved into entire water parks and poolscapes running the length of the uppermost decks and on some cruise ships, guests can actually surf.