Fort of Santo António da Barra is a 16th-century coastal fortress located in Estoril, built during the reign of King Sebastian to defend the entrance to the Tagus River. Once part of Lisbon’s maritime defense system, it later served as a summer retreat for King Dom Carlos. From the sea, its imposing walls stand as a symbol of Portugal’s military and royal heritage, guarding the coast between Cascais and Lisbon.

Cascais Bay is a naturally sheltered cove framed by golden beaches, historic forts, and elegant seaside buildings. Once a royal summer retreat and a safe haven for fishermen and explorers, the bay offers calm waters and breathtaking views of the old town and coastline. Seen from the sea, it’s one of the most iconic and picturesque spots on the Portuguese Riviera — a perfect blend of history, charm, and natural beauty.

Fort of São Julião da Barra is the largest and one of the most important maritime fortresses in Portugal. Built in the 16th century at the mouth of the Tagus River, it served as a key defense point for Lisbon, protecting the city from naval attacks. Its strategic position and massive walls made it a symbol of Portugal’s military strength. Today, it remains an impressive landmark, visible from the sea as you approach Lisbon — marking the gateway to one of the world’s most historic harbors.

Belém Tower is one of Lisbon’s most iconic landmarks and a UNESCO World Heritage Site. Built in the early 16th century as a defensive fortress at the entrance of the Tagus River, it also served as a ceremonial gateway for Portuguese explorers during the Age of Discoveries. With its striking Manueline architecture and riverside location, the tower is a symbol of Portugal’s maritime heritage and an unforgettable sight when arriving in Lisbon by boat.

The Monument to the Discoveries (Padrão dos Descobrimentos) is a striking riverside tribute to Portugal’s Age of Exploration. Built in 1960 on the northern bank of the Tagus River in Belém, it celebrates the explorers, navigators, and visionaries who expanded the known world. Shaped like a caravel, the monument features leading figures such as Prince Henry the Navigator at the prow. From the water, it stands as a powerful symbol of Portugal’s maritime legacy and spirit of discovery.

The 25th of April Bridge is one of Lisbon’s most iconic structures, spanning the Tagus River with its elegant red steel design. Opened in 1966 and often compared to San Francisco’s Golden Gate Bridge, it connects Lisbon to Almada and serves both road and rail traffic. Named after the 1974 revolution that restored democracy in Portugal, the bridge offers a breathtaking sight when viewed from the river — especially at sunset, as you sail beneath it toward the heart of the city.

The Praça do Comércio, also known as Commerce Square, is one of Lisbon’s most majestic landmarks, opening directly onto the Tagus River. Once the site of the Royal Palace, it was rebuilt after the 1755 earthquake and became the city’s grand gateway for arriving ships and merchants. Framed by elegant arcades and crowned by the Arco da Rua Augusta, it symbolizes Lisbon’s connection to trade, exploration, and maritime power. From the river, it's a stunning and historically rich sight as you approach the city.

São Jorge Castle crowns one of Lisbon’s highest hills and offers a commanding view over the city and the Tagus River. Originally a Moorish fort, it was taken by the Portuguese in the 12th century and later served as a royal residence. Its walls and towers still dominate the skyline and can be spotted from the river — a reminder of Lisbon’s ancient roots and its strategic importance throughout history.