This is a must see place in Lisbon. Most admiring ornate & architectural marvel of the yester centuries!
Entry to the church is free but to the monastery, a ticket has to be purchased.
Best way to reach the place is by tram or bus.
Opposite this monastery is the Maritime Explorers monument. And you can spend a wonderful pleasant time at the Praca do Imperio garden, opposite the monastery.
And don't miss to eat the hot chestnuts at any of the places. They could be your favourite too, just as they are for the squirrels.!