The story of Olympic Stadium began in 1927, when City of Helsinki and several sport associations created the Stadium Foundation. The purpose of foundation was to build an adequate venue for the summer olympics. Construction of the Olympic Stadium began in 1934 and it was completed in 1938. It was designed in functionalistic style by the architects Yrjö Lindegren and Toivo Jäntti.
The stadium was built to host the 1940 Summer Olympics, which were moved from Tokyo to Helsinki before being cancelled due to World War II. After 12 years delay the XVth Olympic Games were finally held in Helsinki Olympic Stadium in 1952. The stadium was also the venue for the first World Athletics Championships in 1983 as well as for the 2005 World Championships in Athletics. It is also the home stadium of the Finland national football team.
Olympic Stadium is still in active use. The National Sports Museum is also situated to the stadium and the 72 meters high tower is popular place to see the nice view over the downtown of Helsinki.
The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.