There is a huge gold Buddha at ground level which claims to be biggest in the world, but it seems it is only the second biggest in Sri Lanka. As it was built in 2001 I would suggest forgetting the modern frontage and climb to the historical caves.
I would guess there are about 300 steps but they are in flights and wide enough so you can catch your breath without inconveniencing others. At the top are 5 caves with statuary and murals aged between 900 and 200 years old.
Very impressive and try to get a summary say from a guidebook. Well worth the puffing to get up and a very interesting insight into Buddhism.