Things to do
Six honest picks. Not sixty.
From Wikipedia + OpenStreetMap. No affiliate links, no crowd bias.
Primeira Travessia Aérea do Atlântico Sul
The Monument to the First Aerial Crossing of the South Atlantic is a monument in Lisbon, Portugal, placed at Brasília Avenue, within the civil parish of Belém. It consists of a stainless steel replica sculpture of Fairey III biplane, that was used by Gago Coutinho and Sacadura Cabral during their 1922 South Atlantic aerial crossing. Inside are also installed their life-sized busts. It was designed by architects Martins Bairrada and Leopoldo Soares Branc, and sculptor Domingos Soares Branco, and unveiled in 1991.
Wikipedia → Pelourinho de Lisboa
The Pillory of Lisbon is a pillory situated in the municipal square of the Portuguese capital, classified as a National Monument.
Wikipedia → Grutas da Quinta do Anjo
The four Artificial caves of Casal do Pardo, also known as the Caves of Quinta do Anjo, were neolithic tombs. They are situated in Palmela municipality in the Setúbal District, of Portugal, about 25 km (16 mi) south of the capital of Lisbon. These caves were classified as a National Monument of Portugal in 1934.
Wikipedia → Grutas do Poço Velho
The Caves of Poço Velho are located in the centre of Cascais in the Lisbon district of Portugal. Their use, primarily as a necropolis, is believed to date back to the Paleolithic era.
Wikipedia → Anta de Agualva
The Anta de Agualva, also known as the Anta do Carrascal, is a megalithic dolmen situated in an urban area of Agualva-Cacém in the municipality of Sintra, in the Lisbon District of Portugal. First identified by Carlos Ribeiro in 1875, the dolmen has recently been restored and can be easily visited.
Wikipedia → High Cross
Wikipedia → 
