Hohenburg castle was first mentioned in 1146 by the Counts of Homburg. They gave their name to Homburg, the district capital and university town which lies at the foot of the castle, and which was granted town status by Emperor Ludwig the Bavarian in 1330. After the death of the last Count of Homburg in 1449, the castle and town fell to the Counts of Nassau-Saarbrücken.
In the second half of the 16th century, Count Johann IV of Nassau-Saarbrücken refashioned the castle into a Renaissance palace as his seat of residence and made it more secure. In the years from 1680 to 1692, King Louis XIV commissioned his fortress builder, Vauban, to build up the palace and town into a strong fortress.
After the peace treaties of Rijswijk and Baden, the fortress was razed in the years 1697 and 1714. There were two gate systems in the mighty fortress wall. The market square enclosure and the road system also originate from this period.
Since 1981, the impressive ruins of the castle and fortress have been uncovered by extensive excavations and restored. The site is easily accessed along well-signposted walking trails. From the North bastion, the rock plateau is reached by a spiral staircase. There is an impressive view over the upstream plain of the city including Kaiserstrasse, which was named after Napoleon. The caponier takes you to the first ravelin and from there onto the glacis, which today is laid out like a park.
Below the ruins of the Hohenburg Castle there are Europe’s largest man-made mottled sandstone caves. Over twelve floors of mysterious corridors lead to impressive domed halls.
The church of the former Franciscan monastery was built probably between 1515 and 1520. It is located in the UNESCO World Heritage Site of Old Rauma. The church stands by the small stream of Raumanjoki (Rauma river).
The exact age of the Church of the Holy Cross is unknown, but it was built to serve as the monastery church of the Rauma Franciscan Friary. The monastery had been established in the early 15th century and a wooden church was built on this location around the year 1420.
The Church of the Holy Cross served the monastery until 1538, when it was abandoned for a hundred years as the Franciscan friary was disbanded in the Swedish Reformation. The church was re-established as a Lutheran church in 1640, when the nearby Church of the Holy Trinity was destroyed by fire.
The choir of the two-aisle grey granite church features medieval murals and frescoes. The white steeple of the church was built in 1816 and has served as a landmark for seafarers.