One image: Mausoleum of Cecilia Metella

This building is the tomb of Cecilia Metella, on the Via Appia Antica, outside the walls of Rome.

Not much is known about the woman for whom the tomb was constructed, except that her father was Quintus Caecilius Metellus Cretico, and that she was the wife of Crassus son of Marcus Licinius Crassus, who suppressed the slave revolt led by Spartacus and who was in the first triumvirate with Caesar and Pompey. 

It's unusual to see a tomb of this size for a woman of the time (the 1st century BC), so it is thought that the tomb was more a display of the wealth and importance of her family than that of the individual.

The top section was added in the 14th century, and the structure was apparently used as a fortification. According to Lonely Planet, it was occupied "by the Caetani family, who used to threaten passing traffic into paying a toll".