Torre Fiorenzana is a tower house built in the late 12th century for the local de Grono family. The first mention of the family is 1219. They appear again in local records in 1286 and 1288. The Canon Bernardinus of Grono and the Provost Heinrich appear to have been the last male members of the family. By 1314 it was owned by the powerful Lords of Sax-Misox and a branch of the family inhabited it. In the 14th century they were signing documents as de Saco de Grono and in the 15th century were de Saco de Fiorenzana. According to tradition, in 1406 the powerful leader of the family, Albert von Sax, was murdered at Fiorenzana.
In the 16th century the tower was locally owned. The coat of arms of the Three Leagues was painted on it at that time. Over the following centuries, it was inhabited by a number of local families and today remains privately owned. The exterior was studied and repaired in 1978.
The castle is located in the center of Grono village. It is a five-story, rectangular tower. The crow-stepped gables along the roof were added by the Lords of Sax-Misox in the 14th century. The original high entrance was located on the third floor and is still visible.
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Celje Castle was once the largest fortification on Slovenian territory. The first fortified building on the site (a Romanesque palace) was built in the first half of the 13th century by the Counts of Heunburg from Carinthia on the stony outcrop on the western side of the ridge where the castle stands. It had five sides, or four plus the southern side, which was a natural defence. The first written records of the castle date back to between 1125 and 1137; it was probably built by Count Gunter. In the western section of the castle, there was a building with several floors. Remains of the walls of this palatium have survived. In the eastern section, there was an enclosed courtyard with large water reservoirs. The eastern wall, which protects the castle from its most exposed side, was around three metres thicker than the rest of the curtain wall. The wall was topped with a parapet and protected walkway.