Misc: what was the profession of the singer of the 1963 hit dominique?

Questions

GEOGRAPHY; In which European city is there a lake called the Tjorn?

Which Asian City other than the walled section of Bejing which contains the Imperial Palace was also known as the Forbidden City?

Which city was the capital of Timurs empire?

In the centre of which South American city is the Square of Three Powers?

After which city is mayonnaise said to be named?