The Conventico Caves are historic caves located in Melilla la Vieja and are accessed from the Museum of Sacred Art, in the Spanish city of Melilla and are part of the Historic Artistic Complex of the City of Melilla, an Asset of Cultural Interest.

Initially natural caves excavated by water in Cala de Trápana, they were used by Phoenicians, Romans, Arabs to shelter themselves by placing their ships in the large cavity and finally by the Spanish, who excavated several levels above the natural caves in the 18th century to store food, although their most famous use was when they were used to house the population during the Siege of Melilla (1774–1775).

In 1925, with the construction of the Port of Melilla, the inlet was filled with sand, forming a beach. Between 1993 and 1995, the parabolic arch and the walls towards Cala de Trápana were built, and later brick vaults were built on the third level and the streets above these were paved, Miguel Acosta and Concepción, due to the risk of collapse, making them accessible to visitors coinciding with the 500th anniversary of the Spanish occupation of Melilla with the installation of wooden pavements. Between 1998 and 2000, the first level was shored up and reinforced, all the levels were connected, and toilets and a sewage treatment plant were built under the staircase that goes down to Trápana.

It has a gigantic open cavity, reinforced by a parabolic arch of stone and brick and three interconnected levels, from lowest to highest. The first consists of two intersecting naves and was used as a church, the second, a set of rooms connected to each other and with windows to the outside, the third being similar to the previous one, but with smaller and lower rooms.