The Church of the Assumption of the Virgin Mary lies next to the Blatná 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 gained its present looks in 1515 when the reconstruction was finished.
The bell tower is located next to the church. It was first built in 1722–1723. 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.
Ogrodzieniec Castle is a ruined medieval castle originally built in the 14th–15th century by the W³odkowie Sulimczycy family. Established in the early 12th century, during the reign of Boles³aw III Wrymouth, the first stronghold was razed by the Tatars in 1241. In the mid-14th century a new gothic castle was built here to accommodate the Sulimczycy family. Surrounded by three high rocks, the castle was well integrated into the area. The defensive walls were built to close the circuit formed by the rocks, and a narrow opening between two of the rocks served as an entrance.
In 1470 the castle and lands were bought by the wealthy Cracovian townsmen, Ibram and Piotr Salomon. Then, Ogrodzieniec became the property of Jan Feliks Rzeszowski, the rector of Przemy¶l and the canon of Cracow. The owners of the castle about that time were also Jan and Andrzej Rzeszowskis, and later Pilecki and Che³miñski families. In 1523 the castle was bought by Jan Boner.