In 1998, Portugal honored the 500th anniversary of Vasco da Gama's historic journey to India by constructing the longest bridge in Europe. A gondola provides incredible views over the bridge, the Tagus estuary which it spans, and the former pavilions of the 1998 World Expo.
If you've spent enough time among the cobblestone streets and 19th-century architecture of Baixa and central Lisbon, the Parque des Nacões might come as a shock. This area which stretches along the Tagus estuary northeast of the city center, was totally redeveloped for Lisbon's 1998 World Expo, and is defined by its modern pavilions, parks and attractions.
Built in the mid 1700s, the Aqueduct das Águas Livres soars 65 meters above the Alcantâra Valley. Today, the waters have stopped running, and the aqueduct has been opened to tourism. For a small fee, you can walk all the way across.