Booking tickets on line is the thing to do : It saves you considerable queuing, and London is scorching at the moment so you are better off indoors.
- Stunningly beautiful!
- History, culture and religion intertwined as not only royalty lie buried or are paid homage to here but also a bunch of old Prime Ministers, writers and other prominent figures (mostly men...) from British history.
- Excellent audio-guides included in the entrance fee.
- Photography is prohibited, and the entrance fee was £20. Those are all the cons I can think of.
In short : Fascinating!