Due to the rocky base of the wall's sections, the citadel's fortifications are irregular. Inside the fortress, highlights include the Chapel of Santa Bárbara, the round bastion, the large cistern, the casemates, and the entire parade grounds. The citadel served as a political prison from the 18th to the 20th centuries. This space houses the National Museum of Resistance and Freedom.

Located next to Consolação beach, it was built in the mid-17th century to reinforce the defenses of Peniche Bay. It features four triangular bastions and five platforms housing the fire hydrants, with access to the interior via a bridge. Over the years, and especially after the 1755 earthquake, it underwent renovations but has always maintained its original Mannerist structure.

This building originated from an old mosque, whose minaret has been converted into a bell tower. Columns with inverted truncated pyramidal capitals, of Byzantine influence, are rare in Portugal. This church houses a valuable sacred treasure, comprising vestments from the 16th to 18th centuries and silver religious objects.

Located inside the Castle, where exhibitions of the archaeological heritage of the municipality of Alcoutim are on display, with a historical journey that began more than 5,000 years ago, covering the Neolithic, Chalcolithic, Roman, Visigothic and Islamic periods, relevant in the archaeological research carried out in recent decades in Alcoutim.

This museum showcases the history of sacred art from the municipality's various churches. The collection consists mostly of photographs and panels.

This museum showcases the entire history of the Guadiana River, from river transportation of minerals to various types of artisanal fishing, and the smuggling activities that occurred during the Estado Novo era. A highlight is the exhibition of miniatures by José Murta, entitled "Traditional Boats of the Lower Guadiana."

Megalithic monuments consisting of two menhirs situated relatively close to each other. It is a monolith carved from a block of greywacke, dark gray in color, with a brown patinated surface. It has a star-like appearance, an ellipsoidal cross-section, and measures a little over three meters in height, making it the largest example of greywacke known to date in Portugal. Everything indicates that these menhirs were built in the second half of the fourth millennium BC. The site is surrounded by a net, so it can only be visited from the outside.

A set of sculptures scattered throughout the riverside area of Alcoutim depicting various scenes from the activities of the smugglers who inhabited the region in former times.

Tile panel depicting the town's traditional activities, by Carlos Luz, consisting of 31 panels that tell and preserve the stories of Alcoutim.

It overlooks the river and, according to archaeological excavations, was inhabited during the Iron Age and early Roman occupation. Built in the 14th century as a border defense, it underwent renovations in the 17th century. Inside, there is a small museum displaying archaeological finds and remains of buildings discovered during the excavations.