Considering the Quinta da Vigia in Sintra?
A VT member wrote the following comment about visiting Sintra:
Small access by TinKan
If you drive to Sintra and into the old part of the town remember that the roads are very small and there are many one way streets. If you miss a parking spot you will need to exit the town and start from the begining. You are better just parking on the outskirts of town in some of the larger parking lots and walking into town.