The Drususstein (Drusus stone) is a nearly 20 metres high masonry block of Roman origin on the grounds of the citadel of Mainz. It was originally cast in marble. Researchers now largely accept that this is the structural remnant of the cenotaph mentioned by writers like Eutropius and Suetonius, erected in 9 BC by Roman troops in honour of the deceased general Drusus, in Mogontiacum (now Mainz) as part of the roman funerary art.
During the early days of the Principate the Drususstein was the starting point for elaborate memorial services in honour of Drusus, and the centre of the imperial cult in Mogontiacum. A procession road linked it to the public theater of Mogontiacum that had about 12,000 seats, making it the largest known theater north of the Alps. It may have hosted a part of the annual ceremonies at the day of Drusus' death, and probably also at his birthday.
After being robbed of its marble casing in the early Middle Ages, the Drususstein served as a watchtower in the fortifications of the city in the 16th century. For that purpose a staircase and doorframe were made in the structure, which had been up to that point a massive building. Besides the pillars of aqueducts and the stage of the theatre, the Drususstein is one of the few remaining visible reminders of Roman Mogontiacum. Together with the Igel Column, it is the only funerary monument north of the Alps dating from antiquity that remains in its original location.
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.