The castle is composed of different era of construction as depicted by the different colours. It was very picturesque with great views. Note, you can only see the Castelo dos Mouros from one side.
If you get hungry, there is also a cafeteria there which sells food and drinks for a reasonable price together with a sit down table area.
If you start your day tour early from Lisbon and take the public bus (that loops from the station to town, then Costelo dos Mouros before Palacio Nacional da Pena and returning to town and then the train station) you'll have plenty of time to venture Pena park as well which is included in the entrance fee.
Word of warning, take it easy heading up to the entrance of Palaicio Nacional da Pena as it's a relatively steep climb. If the going gets tough, think of the beauty that is awaiting you and also it'll be a great walk back down to the bus. :)
P.S. See my review of Costelo dos Mouros for comments about the weather.
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