National Museum & Gallery of Wales
Description
There are lots of exhibitions and artifacts. You could very easily spend a couple of days exploring all the exhibits. One of the main ones is a gallery devoted to the history of the planet and explains the last 700,000,000 years (or so) through what has happened to the land-mass that is now Wales.
Charge
Free
Getting There
Latitude: 51.485712; Longitude: -3.177259
What3Words: stir.crops.coast
Disclaimer: Details correct at time of writing (13/02/2005), and on time of last update (28/03/2005) but may no longer be accurate, particularly if some time has passed.