Fantaseas Dartford This was the coolest thing ever to be built in the world and one day it literally vanished. Situated between the QE2 bridge and, what is now Bluewater, stood a palace of watery fun all housed under a tropical dome. You could could come out of the wave pool and literally buy a burger and coke at the water's edge. There were more water slides than were needed and a huge lazy river around the perimeter. Fantaseas you are dead but not forgotten.