The Belem Tower is a fortified tower that serves as a monument for the Age of Discovery. Built in the early 16th century, the tower has a rich history and is one of the must-see attractions in the city.
The Lisbon Oceanarium is one of the largest aquariums in Europe and is home to various marine creatures, including seabirds, mammals, and fish. It's a perfect place for adventure lovers; you can dive with sharks or watch them during their feeding times.
Parque das Nações is a modern, waterfront area built for Expo '98. It features various parks, gardens, and artworks, including the famous Vasco da Gama Tower. It also has a cable car and indoor karting track for thrill-seekers.
The Jeronimos Monastery is a UNESCO World Heritage Site and a symbol of Portugal's power and wealth during the Age of Exploration. The architecture and history of the monastery are awe-inspiring and perfect for adventure lovers who are history buffs.
Since you have only one day to explore the city, it is best to take a taxi between locations. It will be faster, and you won't have to worry about public transportation schedules. A taxi would cost around €30-€40 for the entire day, and travel time between locations would be around 10-20 minutes.
If you have more time, you can consider visiting the St. George Castle, Alfama District, or taking a tram ride. If you have less time, you can skip the Lisbon Oceanarium or Jeronimos Monastery.
Lisbon's airport, Lisbon Portela Airport (LIS), is located about 7km from the city center. It is the main international gateway for travelers visiting Lisbon and Portugal. You can take a taxi or public transportation to reach the city center from the airport.