The historic town centre is well preserved and is protected by law as an urban monument zone.

The stream Kosový potok flows along the eastern municipal border and then joins the Mže.

Another misfortune came in the 17th century during the Thirty Years' War, when Planá was conquered and looted several times by various armies.

During their reign, mining flourished and the mint was moved to Planá after it ceased to exist in Jáchymov.

It is the nationwide important monument with unique frescoes and a rare Romanesque portal with an arched frieze.

[8] The Mining Museum is located in the Ondřej Schlick adit, which was excavated in the 16th century.

[8] The castle was continuously built and rebuilt from the 13th to the 20th century and therefore contains building elements from Gothic to the present.