The Circus of Maxentius is an ancient part of a complex erected by emperor Maxentius on the Via Appia between AD 306 and 312. It is situated between the second and third miles of the Via Appia between the basilica and catacombs of San Sebastiano and the imposing late republican tomb of Caecilia Metella, which dominates the hill that rises immediately to the east of the complex.
The Circus itself is the best preserved in the area of Rome, and is second only in size to the Circus Maximus in Rome. The only games recorded at the circus were its inaugural ones and these are generally thought to have been funerary in character. They would have been held in honour of Maxentius' son Valerius Romulus, who died in AD 309 at a very young age and who was probably interred in the adjacent cylindrical tomb (tomb of Romulus). The imperial box of the circus is connected, via a covered portico, to the villa of Maxentius, whose scant remains are today obscured by dense foliage, except for the apse of the basilical audience hall, which pokes out from the tree tops. The complex was probably never used after the death of Maxentius in AD 312.
References:The Roman Theatre of Mérida is a construction promoted by the consul Vipsanius Agrippa in the Roman city of Emerita Augusta, capital of Lusitania (current Mérida). It was constructed in the years 16 to 15 BCE. One of the most famous and visited landmarks in Spain, the Roman Theatre of Mérida is regarded as a Spanish cultural icon and was chosen as one of the 12 Treasures of Spain.
The theatre has undergone several renovations, notably at the end of the 1st century or early 2nd century CE (possibly during the reign of Emperor Trajan), when the current facade of the scaenae frons was erected, and another in the time of Constantine I (between 330 and 340), which introduced new decorative-architectural elements and a walkway around the monument. Following the theatre"s abandonment in Late Antiquity, it was slowly covered with earth, with only the upper tiers of seats (summa cavea) remaining visible.