1. St. Paul's cathedral was built by sir Christopher Wren in the 17 th century.
2. The Tsar Cannon was made by the famous cast master Andrei Chokhov in 1587.
3. Moscow was started as a fortress by Russian princes.
4. The lighthouse known as the Pharos of Aleksandriya was designed by the Greek architect Sostratas .
5. London was founded by the Romans more than 2000 years ago.
6. The Peter and Paul fortress was transformed into a prison by Russian tsars.
