http://www.poland.travel/en-us/cities/olsztyn-copernicus-city-with-15-

lakes/

Olsztyn

Olsztyn is situated in the southern part of Warmia

on the river Łyna, within the boundaries of

Olsztyńskie Lakeland. There are 15 lakes situated

within the borders of Olsztyn, parks and forests.

The most important monuments of Olsztyn are the

Old Town with the castle complex and Saint Jacob

Apostle’s Church dating back to the XIV century.

The monuments of the Olsztyn Town Square are

situated on the European Route of Gothic and the

church is deemed one of the greatest monuments

of brick gothic era in Poland.

Nicolas Copernicus himself lived in the castle in

Olsztyn for many years.

In 1521 he prepared the stronghold/bastion for

defence against the Teutonic Knights Order armies,

here Copernicus wrote one of the first works in the

history of economical thought, explaining the

phenomenon of inflation.

The character of Copernicus is commemorated by

two monuments and memorial boards. A fragment

of a wall, on which the great astronomer drew

auxiliary lines during his research on the day and

night of the equinox in 1517 actually remained in

the castle.