The remains of the castle can be visited
Neukastel Castle

Above Leinsweiler in Rhineland-Palatinate stands the castle ruin Neukastel, a former palatinate hilltop castle from the 12th century. Although only a few wall remnants remain, the complex includes an upper castle and a lower castle, which encompasses a rock cave and a neck ditch.
History+
The first documented mention of the castle, presumably built by the Salian dynasty, occurred in 1123 in connection with Heinrich von Neukastel. In 1246, the castle was handed over to King Konrad IV by Isengard, wife of the Imperial Steward Philipp I von Falkenstein, and subsequently served as an imperial castle to protect the nearby Trifels Castle. Ludwig von Schüpf, bailiff in Speyergau, named himself after the castle around 1252/53. In 1307, Neukastel became a fief of Nikolaus von Speyer. King Heinrich VII handed over the castle in 1309 to Count Georg I von Veldenz, on the condition that he invest funds from the Jewish tax and customs duties into Trifels and Neukastel castles. Emperor Ludwig the Bavarian pledged the castle in 1330 to the Palatine Counts Rudolf II and Ruprecht I.
Image: Ulli1105 / CC BY 3.0 via Wikimedia Commons
Location: 49.1892, 8.0157