At the center of Tallinn's new town is the Piazza Vilu, a main street leading from the square to the old town. There is one of the largest hotels in Tallinn ── the Vilu Hotel. Around the square are modern highways radiated to other cities in Estonia. There are many parks in the new town. At the confluence of the seaside boulevard, there is Kadriorg Park, which was ordered by the Russian emperor Peter the Great. The park features a 16-metre bronze angel statue of the Estonian sculptor Adam in 1902, said to have been built to commemorate the 1893 sinking of the Russian warship the Mermaid. Near the park is one of Europe's great music venues, an open-air singing ground built in 1960. The stage is parabolic, with its back to the sea and can accommodate 30,000 people on the same stage, while the audience seat is set on the natural semicircular platform facing the sea, with a capacity of 150,000. The city has many famous historical sites, including castles, churches and other 13th-15th century buildings, among which the Oleviste Cathedral is the tallest church on the Baltic coast, and medieval walls, towers and castles, which still stand and still exist.