Before planes, arriving at a coastal city from some distant place was mainly achieved boat. And the transition from boat to land was important.
The Cais das Colunas in Lisbon's historic centre was built after the 1755 earthquake that destroyed much of the city. This new quay would provide a ceremonial entrance into the rebuilt city with two columns celebrating Wisdom and Devotion marking the importance of this place and this city in global relations.
So fast forward to today, and the quay isn't used by boats anymore. It's a great sunset viewpoint or to gaze toward Almada across the river and zone out. With tourists, it's also a favourite selfie spot!
Ps. I spent hours training the guy centre left to balance a marble ball on his head... good job don't you think?