Pula Arena - Credit: Wikimedia Commons
The Pula Arena (; ) is a Roman amphitheatre located in Pula, Croatia. It is the only remaining Roman amphitheatre to have four side towers entirely preserved. It was constructed between 27 BC and AD 68,Kristina Džin: 2009, Page 7 and is among the world's six largest surviving Roman arenas. The arena is also the country's best-preserved ancient monument. Read more on Wikipedia
Source: en.wikipedia.org