Photo - Hohlstein Höhle
© Muelchkaffee · CC BY-SA 4.0, https://creativecommons.org/licenses/by-sa/4.0/ · Wikimedia Commons · https://commons.wikimedia.org/wiki/File:Eingang_der_Hilgersh%C3%A4user_H%C3%B6hle.jpg
Contains information from Grottocenter (Wikicaves), grottocenter.org, made available under the Open Database License (ODbL 1.0, https://opendatacommons.org/licenses/odbl/1-0/), modified. · data as of 2026 · Source: Grottocenter (Association Wikicaves), worldwide collaborative cave database (grottocenter.org), modified. CC BY-SA 3.0, https://creativecommons.org/licenses/by-sa/3.0/ Grottocenter (Wikicaves) · Text by Oliver (Wikipedia) · https://grottocenter.org/ui/entrances/68971 · data as of 2026 · The derived data is available on request under the ODbL: [email protected]