Old Rauma is the largest unified historical wooden town in the Nordic countries. Fire has destroyed it several times since 1500s, last major one occured in 1682. There are 600 buildings in old town, mostly privately owned. Oldest still existing houses are from the 18th century.
Locations of special interest include the Kirsti house, which is a seaman's house from the 18th and 19th centuries, and the Marela house, which is a shipowner's house dating to the 18th century but with a 19th century facade, both of which are currently museums. The population of Old Rauma is 800. the Church of the Holy Cross, an old Franciscan monastery church from the 15th century with medieval paintings and the old town hall from 1776.
In 1991 Old Rauma was inscribed on the UNESCO World Heritage list.
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.