The sheer size of the Triumphal Arch in Lisbon is breathtaking and a must see. It is located close to the water and is the start to Rua Augusta which is a closed street to cars in the center of the city.
It is worth taking the elevator and some stairs to the top of the arch to see the amazing views of the city.
There are a number of different ways to see the magnificent views of Lisbon and the one I recommend is the one from the top of the Triumphal Arch in the center of the city. It is only a 2.50 Euro fee to go to the top and something that few seem to know about as there were only a handful of others at the top. It was like we had the entire city to ourselves.