The old Custom House and the open air concert arena
The water tower
If anyone is familiar with the TV series of Torchwood they will recognise these features in Cardiff Bay.
The series, along with the Dr. Who episodes, was filmed in Cardiff and together they have boosted tourism to the city. The monolith is a water tower and if you enlarge it you can see water cascading down the sides. The Torchwood headquarters were supposedly below it with the entrance at the foot of the tower.
I took these pictures early in the morning when no one was out and about, apart from cyclists who fancied a ride in the Spring sun.