The ruins of Lichnice Castle are on the edge of the Iron Mountains in the municipality of Třemošnice. The castle was probably constructed as a royal base in the first half of the 13th century. It was first mentioned in 1261, when it was in possession of Smil of Ronow, who called himself 'Smil of Lichtenburg' and thereby created the 'von Lichtenburg' family.
The castle had a triangular floor plan with two residential towers. In the 14th century, alterations were made, and it was reacquired by the Bohemian Crown in 1410. It was conquered in 1421, during the Hussite Wars, and besieged unsuccessfully in 1428.
In 1490, the castle and estate of Lichtenburg were acquired by the Trčka of Lípa family, who rebuilt the castle in a late Gothic style.
The edifice lost its importance at the end of the 16th century, and the fortifications were dismantled. By 1700, it was already described as a ruin.
References:Duino Castle was built by the Wallsee family in 1389 on the cliffs overlooking the Gulf of Trieste. It replaced an older castle from the 11th century. Over time, the Wallsee family disappeared and the castle, after having been used as a prison, became the residence of the Luogar and Hofer.
At the end of the 19th century it became the property of Prince Alexander von Thurn und Taxis from the Czech branch of the House of Thurn and Taxis. It remains with the family to this day with his great-grandson Prince Carlo Alessandro della Torre e Tasso, Duke of Castel Duino the current owner. The castle has been opened to the public as a museum and park.