Stockholm is the only European capital with virgin forest so close to it.
Jerusalem, argue the Jews, is the only capital their nation ever had, and it was never a capital for any others.
That investment was the only outside capital the bank board was able to find for the transactions.
London is now the only European capital without the advantage of its own elected authority.
It is the only Brazilian capital located entirely north of the equator.
In 1878, however, Bellinzona became the only and permanent capital.
Vienna is the only capital with considerable wine-growing inside the city boundaries.
Early in the 20th century, Providence became the only capital of the state.
Cash isn't the only capital we need to think about here, knowledge as capital needs education.
It is probably the only well-preserved Roman capital of a province in the world.