Yellow, grey, and red marbles interchange in this neo-classical church with some baroque features. It very much reminds of Mafra Basilica, except much livelier with paintings by Pompeu Batoni and Pedro Alexandrino instead of statues in chapels and more interesting design of ceiling vignettes. The dome is aiming high up and you can see it from everywhere in the city. From the outside, the church is white. Three doors separated by columns form the first level of the façade. Above the columns are six statues with rays of sun and angels in the middle. The second level ends in neo-classical portico with a cross and baroque floral design on the sides. A balcony connects it on each side with two bell towers that don’t have bells anymore; however, they do have beautiful ornate decorations at the very top ending with a globe (a symbol of Portuguese world discoveries by Vasco da Gama and Magellan), sword, and cross. There is a pre-entrance corridor with statues of saints and beautiful dark wood baroque doors with coat of arms and crown above it lead inside.

The altar with a large painting and canopy above it with white marble rays and two angels is what grabs your attention. Floors are covered with floral rosettes laid out from Sintra marble. The Baroque organ on the right of the altar makes you look a little further to the chapel with an empire style tomb of Queen Maria I who ordered the construction of the church. In the back of the building, there is a hospital that seems to have always been in that place.

A short distance along the street there is an imposing building of the Senate with two soldiers on guard in front.