The Museo Marítimo is a museum located in Cartagena de Indias, Colombia. It only appears during Greatness from Small Beginnings, Second-Story Work and Atlantis of the sands of Uncharted 3: Drake's Deception.
Nathan Drake made his way into the museum, intending to find Francis Drake's ring and steal it. Nate found the ring in a display case on the museum's second floor. The case was locked and required a key to open. After spotting the ring, he noticed Sully using a key to open the case. Nate considered approaching Sully but was ejected from the museum by a suspicious guard.
After Nate stole the key to Francis Drake's ring from Sully, he found a way into the museum to get to the case and steal the ring. He reached the case and opened it with the key. He took the ring and cipher disk and used them together. After Nate put the ring on the decoder, Katherine Marlowe, Victor Sullivan, and Katherine Marlowe's agents arrived in the museum, spotting Nate with the ring and decoder. Nate tried to run away but the other door was blocked with two other agents. Nate was surrounded.
Sully told Nate to give up and let Marlowe have the ring and decoder.
Marlowe took the decoder from Nate's hand and then she told Nate to then give her the ring. Nate wouldn't listen, so Marlowe snatched his hand. When Nate opened his hand, the ring was gone. Nate had then said to Marlowe, "What ring?" Marlowe then laughed and had then slapped Nate. She was insulting Nate and telling him that he shouldn't touch these objects. Nate wouldn't still give Marlowe the ring. Marlowe attempted to slap Nate again until Sully grabbed her hand and told her that Nate is just a kid. Nate quickly runs away. Marlowe had then said to her agents to stop him. Nate had then tried to find a way out of the museum to escape with the ring quickly.
Uncharted 3: Drake's deception's Mueso Marítimo seems to be slightly inspired by the actual Museo Naval del Caribe located in Cartagena de Indias, Colombia.