The east of the old city is the high ground, and this walk takes it the only sensible way: start at the top and let gravity do the rest. Three kilometres, almost all of it descent, from the highest terrace in Lisbon down to the river.
Begin at Miradouro da Senhora do Monte — higher and quieter than the famous viewpoints, the whole city and the castle laid out across the valley. Come early, while the light is low. Down to Miradouro da Graça next, wider and busier, with a quiosque (a garden kiosk-café) under the pines and one of the city's better benches.
Then São Vicente de Fora, the white monastery, its cloisters tiled floor to ceiling in blue and white. Just below it, Campo de Santa Clara holds the Feira da Ladra — the flea market that only happens on Tuesdays and Saturdays, so time the walk for one of those or you'll arrive at an empty square.
Last, the Panteão Nacional: the great white dome begun in 1681 and not topped out until 1966 — proof that some Lisbon projects take their time. Down to Santa Apolónia for the metro, the river at your feet.
