I only visited the most famous part of this complex: the Shrine of the Bab and the Persian gardens which surround it (in Haifa). It is a peacefully, pretty place. The gardens are terraced, which makes them look neat from both above and below. A profusion of purple a green colours greet the visitor. The gardens are great, and make good use of the path in the artistic beauty, something not seen everywhere. The view from the gardens over Haifa, and the plains and mountains of Israel is one of the best views you will ever find in Israel.
On to the Shrine, which pales in comparison to the gardens. It is a nice, elegant building: but not spectacular, it would not top anyones list of most amazing buildings. However it is situated in the best possible spot in relation to the gardens. This makes a complete picture of loveliness. This site deserves its inscription on the World Heritage List mostly on its importance to the Baha'i Faith, not its architectural merit (although I think the garden could hold up to the best in the world).
This site however is quite easy to visit while one is in Israel. Israel is a small country, and Haifa is only 1 hour from Jerusalem, and less from Tel-Aviv. Israel is a wonderful country and I highly recommend a visit!!!!