The cave was discovered on October 24, 1874 by Johann Ziegler in one of the located near Honau limestone quarries. The tuff (not of volcanic origin!), Popular as a building material, was mined in numerous quarries in the area in the 19th century. The cave quickly received great attention; on Whitsun Monday 1875 it was opened on the day of the Nebelhöhlenfest as an illuminated show cave. Already in 1884, the candle lighting of the cave was replaced by electric light. The named after the Württemberg Queen Olga cave was thus the first electrically illuminated show cave in Germany. It was preceded in 1883 by the Austrian Kraushöhle near Gams in Styria; In the same year 1884 the Adelsberger grottos (Postojnska Jama) received in the today's Slovenia an electric lighting.
In the years 1901 to 1903, the Lichtenstein Festival was held on the square near the cave. Especially for the performance of Wilhelm Hauff's work Lichtenstein a stage house was built here, which was demolished after the games but again. After the Second World War, the cave was closed for several years, as none of the heirs lived in Honau. Eventually, the property with the inn passed into the hands of the Evangelical-Methodist Church. Today there is a senior center here. The Swabian Albverein operated the reopening, which took place in 1972. Today, the Olga Cave is jointly managed by the local chapter Honau of the Swabian Albverein and the Cave Research Group Pfullingen. The Olga Cave is open between March and November on the first Sunday of every month.
Source: Wikipedia