They were originally discovered in 1907, but mining activity did not begin until 1917.

Originally discovered in 1949, it is known only from a single specimen.

Originally discovered in 1883 by two school children, it today offers guided tours.

No-one knows exactly who originally discovered the existence of time.

It was originally discovered in 1849, although the structure remained unsolved until 1993.

The cave was originally discovered by limestone miners in the 19th century.

A Roman swimming pool, originally discovered in 1896, is newly open, though 20 feet underground.

Originally discovered by missionaries, the boulder sparked the interest of British investors.

Most of the drugs used by humans were originally discovered as plant secondary metabolites.

The effect of grapefruit juice with regard to drug absorption was originally discovered in 1989.