Considered the largest archaeological crypt in the country, it is located beneath the Castle of Alcácer do Sal, now transformed into the Pousada D. Afonso II. It presents traces of the Iron Age dating from the 6th century BC, as well as structures from the Roman period and the Islamic occupation, covering a considerable area. Medieval walls from the post-Reconquista Christian era were also found, based partially on Roman walls which, in turn, overlap older pre-existing structures dating from the Iron Age.

An old olive oil press, restored using traditional techniques and materials, has now been adapted into a museum. It is dedicated to the bread-making cycle, from sowing to baking. In addition to the permanent exhibition, the MET hosts temporary exhibitions.

The foundation of this temple is attributed to the Order of Santiago and dates back to the end of the 12th century. It is a Romanesque-Gothic church with three naves, notable for its portals and capitals with zoomorphic decoration.

The station is buried beneath an olive grove. It is classified as a National Monument. Four types of graves were found at this station, all of them cremation graves.

A castle of Muslim construction whose occupation dates back to the 6th century BC. Definitely conquered by the Portuguese crown in 1217, it lost its military function in the 15th century. In the 16th century, the Carmelite Order of Aracoelli founded its convent there, remaining until 1834. Currently, it is possible to observe ruins of the castle, the Aracoelli convent, the 13th-century church of Santa Maria, remains of the town and various dwellings, and the Archaeological Crypt on the lower floor of the Pousada (inn).

The Carrasqueira Palafitic Pier is formed by an immense network of walkways built of wood buried in the mud of the marshland that extends into the Sado River. These improvised constructions date back a little over fifty years and are the result of man's struggle against the silting up of the Sado River.

19th-century bridge with a flat deck resting on a semicircular arch.

Also known as the Church of Santa Senhorinha, it is a rural building with a longitudinal plan consisting of a single nave, with side chapels and sacristies, and a bell tower. It incorporates the Chapel of Santa Senhorinha, the Chapel of São Francisco, and the Chapel of Senhor dos Passos.

This space houses the Historic Train (1890-1908) and other material representative of railway activity. The train arrived in Arco de Baúlhe on January 15, 1949.

Pillory set on a square pedestal with three steps. It has a smooth shaft, topped by a capital with heraldic symbols and finished with a pyramid containing a sphere.