The House of Copernicus on Kopernika Street is the birthplace of Nicolaus Copernicus, the astronomer who proposed that the Earth revolves around the Sun rather than the reverse. The building is a 15th-century merchant's house, preserved as part of the old town's broader UNESCO designation, and it now operates as a museum covering Copernicus's life, his heliocentric model, and the scientific revolution his work helped trigger.
The exhibits are spread across several floors and include period astronomical instruments, reconstructions of his working environment, and explanations of his De revolutionibus orbium coelestium that are accessible even without a scientific background. The museum is not large — plan an hour — but it is thoughtfully done. The Copernicus Monument on the market square, erected in 1853, provides the town's central landmark and a useful orientation point.