I visited Port-of-Spain last summer.

The Tower of London is a historic castle located on the north bank of the River Thames.

The Tropic of Cancer is an imaginary line that marks the northernmost point where the sun appears directly overhead at noon.

The Tropic of Capricorn is the southernmost latitude where the sun can be directly overhead.

The annual school festival includes various activities such as tug of war.

The success she achieved was undreamed-of.

This is an unheard-of phenomenon.

The Union of Soviet Socialist Republics was a socialist state that existed from 1922 to 1991.

The United States of America is a country located in North America.

The discovery of a new species in the deep sea was unthought-of.