At the Carmo Convent five bays of pointed arches stand free above you, grass grows between the stones of the floor, and the columns still carry the springing of vaults that are not there. The vaults came down on the congregation on the morning of 1 November 1755, when the earthquake struck a city at mass on All Saints' Day. Only the apse at the far end kept its roof, and the museum is in there.
The apse is the one covered room left, and stepping into it from the open nave is the whole visit in two paces. Inside is the tomb of King Fernando I, carried here from Santarém after soldiers had used its lid as a water trough for horses. Around it stand Roman inscriptions, stone tools from the walled village at Vila Nova de São Pedro, an Egyptian sarcophagus and two Peruvian mummies. The archaeologists given the ruin in 1864 have been adding to it ever since.