Built by King João IV in 1647, this fort was part of the defensive system of the Tagus River mouth. Over the centuries, it has been used and adapted in various ways, including as a customs post, a youth sailing center, and a youth hostel.

This fort, built at a strategic point that allowed it to dominate the entrance to the bar, was one of the most important Portuguese military bases. It is one of the best-preserved forts and the most perfect example of its 16th-century type, originating from Italy. Its esplanades, vaulted casemates, and cistern are notable.

A Pombaline-style palace built in the second half of the 18th century, it served as a leisure estate for the Marquises of Pombal. Highlights include the chapel with 18th-century paintings, the tiles inside and out, two 18th-century statues by Machado de Castro, and the waterfalls in the gardens.

A large park with several walking areas and pleasant corners inviting relaxation. This leisure space in Oeiras features a playground and several cafes.

A well-maintained park with a large grassy area and a variety of trees, including olive and palm trees. This space offers walking, leisure, and relaxation areas.

Founded in the 19th century, this aquarium features 93 aquariums with thousands of different species. Here you'll find Atlantic, tropical, and freshwater marine fauna. Highlights include the collections of stuffed fish and seashells, as well as a collection of King Carlos's fish. It opened in 1898 to commemorate the fourth centenary of the discovery of the sea route to India.

Museum located within the Barcarena Gunpowder Factory. It documents the methods used to manufacture black powder and the energy sources used throughout the factory's approximately 500-year history. Its collection is divided into Science/Technology, History, Military, and Industry categories.

Viewpoint that reveals the Alentejo plains.

This museum is located in the premises of a former olive mill. The exhibits come from donations and collections made in the municipality of Aljustrel, as well as the acquisition of an ethnographic collection amassed by a farmer from Ervidel.

The 25 de Abril Garden features a playground, flowerbeds, and lush, varied vegetation. It's a pleasant and refreshing place to enjoy leisure time.