I'm pretty disappointed that this place has some bad reviews, like there's nothing interesting to see there, or that it's an important place just for us, Romanians. First time when I visited Bellu I was fascinated, not only because of the whole history and the respectable age this place has, but more because of the peaceful atmosphere, the quietness and the beauty of it. The oldest cross in the cemetery dates from 1851, and there are also a lot of beautiful old graves to admire, true works of art. It's like a big, open air museum, which is also free, and if you'd find a guide to tell you the awesome stories some of those places have, you'd be amazed and you'd surely get the goosebumps.
You can actually feel the oldness of the place, the whole thing is impregnated with stories of love, tragedy, sadness, bravery and on and on. There are beautiful statues, carefully sculpted, and architectonic elements in different styles [neobyzantine, modern, classical, and so many others], and there's also the smell of wet marble, of wax and fir trees.
I love that place, and it's always a joy coming back there, I always find new and beautiful things to see.
You may not be allowed to take pictures, because there are guards all over the place and they seem to... well... not allow you to. Therefore, if you happen to get there, pay attention to the beauties around you, and remember them well :)