War Remembrance Monument, Cave-Penney Memorial Cross 1918, Corndon Down, Cherwell, Dartmoor, Devon, England, United Kingdom, Europe

Lourdes Grotto, Lourdes, Hautes Pyrenees, France, Europe

Krizna Jama Cave, Cross Cave, Grahovo, Slovenia, Europe

Main altar in the new Salt Cathedral of Zipaquira, Cundinamarca department, Savannah of Bogota, Colombia, South America

Krizna Jama Cave, Cross Cave, Grahovo, Slovenia, Europe

Krizna Jama Cave, Cross Cave, Grahovo, Slovenia, Europe

Frescoes, Al Nazar Church (Cave Church), 10th century, UNESCO World Heritage Site, Goreme, Nevsehir Merkez, Nevsehir, Anatolia, Turkey, Asia Minor, Asia

Krizna Jama Cave, Cross Cave, Grahovo, Slovenia, Europe

Speleologist in the Krizna Jama Cave, Cross Cave, Grahovo, Slovenia, Europe

Statue Angel with the Cross on the Angel Bridge over the Tiber, Rome, Italy, Europe

Tunnel through a glacier, Gletscherpalast at Kleines Matterhorn (3883 m), Zermatt, Wallis, Valais, Switzerland

Underground Salt Cathedral of Zipaquira, Cundinamarca, Colombia, South America

Stone shaped cross in the underground Salt Cathedral of Zipaquira, Cundinamarca, Colombia, South America

Altar of the underground Salt Cathedral of Zipaquira, Cundinamarca, Colombia, South America

David Gareja Monastery Complex (The 6th Century Rock-Hewn Georgian Orthodox Monastery With Hundreds Of Cave Cells, Churches, Chapels, Refectories And Living Quarters), Kakheti, Georgia

Turkey, Cappadocia, Goreme, Red Valley. Hacli Kilise or The Church of the Cross. Interior of rock cut cave church on the North rim of the Red Valley with detail of ceiling fresco damaged by superstitous gouging to eradicate the evil eye.

Turkey, Cappadocia, Goreme, Red Valley. Hacli Kilise or The Church of the Cross. Exterior of rock cut cave church on the North rim of the Red Valley.