![](/wp-content/uploads/2014/12/Umbrela-Street-in-Agueda-Portugal.jpg)
![](/wp-content/uploads/2014/12/Umbrela-Street-in-Agueda-Portugal.jpg)
10. The Roman Colosseum: This amphitheater was built almost 2000 years ago. It was built with the famous Roman concrete which is the reason it has lasted so long. Taking a guided tour of the Colosseum is the best way to appreciate it.
10. The Roman Colosseum: This amphitheater was built almost 2000 years ago. It was built with the famous Roman concrete which is the reason it has lasted so long. Taking a guided tour of the Colosseum is the best way to appreciate it.