From Lisbon to Sintra, you can take a small train from Rossio train station for an hour to get there. You can buy a round-trip ticket when you buy a ticket, and there are a lot of trips. The terminal is sintra. Sintra's train station is very mini, there is a main road out of the train station, there is a visitor center opposite, what car to take to what attractions can consult the visitor center to take a map. I bought a bus pass for 12 Euro/person, and any car can be used, no matter how many times. Since there is no time to go to the Moorish castle, it is good to stand at the top of the palace. This castle, which looks like the Great Wall, was built when the Arabs occupied the Iberian Peninsula in the 8th and 9th centuries. If there is more time, I think it is worthwhile to look at it in the past. The church inside the castle is not as grand as many famous European cathedrals, but it is also a standard church.