Mount Nebo in Jordan is 817m high and hardly qualifies the usage of the word 'Mount'. It is supposed to be from where Moses saw the Holy Land for the first time. He is also supposed to be buried in the area - no one appears to have found his body though. There is a coach park, part the way up, and you walk up the last (paved) part to the summit. I found it quite cold here in the early morning in December, even though it was a sunny day. On your walk up there you will pass a monument dedicated to Moses. This has been a popular pilgrimmage site for many centuries.
There is a small museum here, showing the recent history of the area, and how it would have been in the past. At the top of the Mount there are supposedly a number of mosaics, and from the picture they look quite impressive. Unfortunately the church which houses these has been closed and is due to open in 'November', which has been the claim for a few years now. There are a two other mosaics next to the museum which you can look at, covered by a tent.
For me, the main reason to come here is the view from the summit. On a clear day you can see the Dead Sea, and the River Jordan and its valley to Jericho in Israel. It has been said that you can also see Jerusalem, but not on the day we went, which was sunny but hazy. This may be easier spotted at night, when you would be able to see the lights.
This is an important holy site and we saw a number of Christian clerics visiting when we did. I believe it costs 1JD/£1 to visit which seems reasonable, apart from the fact that you can't go in the church or see the main mosaics which is disappointing. Unless you are desperate to see the place because of its holy status or for the view, then I think you can give it a miss.
They do have reasonable public toilets here.