The Grand Palace is an impressive place that you must visit!
There is an App for the Grand Palace that you really must download OR read a lot of Background on it.
The ground was consecrated by monks in 1782 (the first year that Bangkok was the Capital City and had 'rule'. Most of the architecture (but not all) can be classified as Bangkok or Ratanakosin style - with differences.
It is impressive, colourful, clean, polished and it is clear that it is an important part of the history and culture of Thailand.
It houses the House of the Emerald Buddha (but we were too late and we were not allowed to take a photograph inside) amongst a plethora of other attractions.
In fact "photographs speak louder than words sometimes" and a link to one of the best sites which I found to give an overview to your trip into the Grand Palace.