ALFAMA. The aqueduct was built between 1732 and 1748 and spans 36 miles, bridging the Alcantara valley via a series of 35 arches. At the time of construction, the arches were the world's tallest, and they remain a formidable sight to this day, having survived the massive 1755 earthquake.

BAIXA. The promenade was established following the devastating earthquake of 1755 and has been the site of numerous events over the years. Initially, only the elite were permitted to enjoy the promenade, a prohibition enforced until 1821. Among the charming fountains and café tables stands a richly detailed monument honoring WWI casualties.

ALFAMA. This Renaissance palace, built in 1523, derives its name from the unusual points ("bicos") comprising the equally unusual façade. An earthquake in 1755 destroyed the two top floors, which were left unrepaired until the 1980s. The ground floor is host to periodic exhibitions.

CASCAIS. An established fishing community since the 12th century, the area blossomed during the 19th century into a lively forum of great food, water sports, and sunny relaxation. Windsurfing, pedal boats and water skiing are particularly popular here.

CASTELO. Known as the "ancient window," this former castle provides a glimpse into the past and a stunning view of Lisbon. Located 110 meters (360 feet) above sea level, this castle is thought to pre-date the Roman invasion and served as the royal residence from the 14th through the 16th centuries. Major renovations in the 1930s saw the castle's ramparts and towers restored, and the 10 majestic towers are open for climbing. From there, you'll enjoy an awe-inspiring view of the Portuguese capital, the Tagus, the Alfama, and the Serras of Monsanto and Sintra.