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

Blatná enjoys an inland version of temperate Oceanic climate (Cfb) with rather balanced temperatures year round.

At that time, the burghers of Blatná gained the privileges that enabled the development of handicraft production and the growth of the business – the right to organize markets and brew beer.

In the second half of the 16th century, Blatná was owned by the Sternberg family for a short time until it was bought by the Polish Counts of Rozdražov.

They have owned the castle continuously, with the exception of the period of communist dictatorship (1948–1989) when it was confiscated by the state.

The town's economy further developed after the railway to Strakonice and Březnice was built at the end of the 19th century.

[5] Under the Lev of Rožmitál family, the fortress was for the first time rebuilt in stone (the oldest parts being the tower and Rožmitálský Palace) and the surrounding marshes were changed into wide water trenches.

Lords of Rožmitál were continuously rebuilding and enlarging the castle, first with the so-called Old Palace, standing separatedly over the remnants of a Romanesque chapel.

The park was created as an English landscape garden at the beginning of the 19th century by František Hildprandt.

Beyond the meadow are preserved old woods with alleys, swamps, streams with footbridges over them, artificial caves, remnants after placer mining and an Empire style summer house.

[10] The Church of the Assumption of the Virgin Mary lies next to the castle, at the end of the main square.

It was founded in the 1290s as a two-aisled building with a long presbytery, and small adytum on the north side.

It was destroyed with most of the town in the big fire of 1834, but was built again in 1835–1836, this time at 52 metres (171 ft) of height.