Torre de Belem (Belem Tower), Lisbon (must see)

Accessed via a narrow pathway extending into the river, the Tower of Belém stands as an impressive symbol of Lisbon and holds the distinction of being a designated World Heritage Site. It represents one of Portugal's purest examples of Manueline architecture, a style prevalent during the reign of King Manuel I. Its windows and staircases are adorned with arches and decorative motifs that commemorate Portugal's explorations in the New World.

Originally constructed as a fortress on what was once an island in the middle of the Tagus River, its purpose was to safeguard the entrance to the port. The construction spanned five years and was completed in 1520. Today, the striking chalk-white tower stands near the river's northern bank, a testament to the shifting of the river's course following the earthquake of 1755.

Present-day visitors have the freedom to explore the tower's different levels, which include a terrace facing the river, once a vantage point for artillery firing. Ascending a steep spiral staircase spanning four levels, each offering a unique framed view of the river, brings you to a top terrace that provides a breezy panorama of Belém. You can also venture into the dungeons, a low-ceilinged chamber originally used for storing gunpowder, and later notorious for housing political prisoners during the 19th century under rule Dom Miguel's rule.

Tip:
The biggest draw here is ascending to the summit via the spiral staircase. Unless you're fortunate enough to find a short queue upon arrival, it's advisable to appreciate the tower's exterior garden rather than spending an extended period waiting to enter. However, if you are determined to explore the interior, it's recommended to purchase your ticket in advance online or from a kiosk located in the nearby park. Using a Lisbon Card may still require you to stand in line like everyone else, but at least you won't need to pay the admission fee!