Forum, Cryptoporticoes, UNESCO, Arles, Bouches du Rhone, Camargue, Provence-Alpes-Cote d'Azur, France

Forum, Cryptoporticoes, UNESCO, Arles, Bouches du Rhone, Camargue, Provence-Alpes-Cote d'Azur, France

Sunken, rock-hewn Christian church, in rural landscape, Lalibela, UNESCO World Heritage Site, Ethiopia, Africa

Roman cisterns, Fermo, Ascoli Piceno, Marche, Italy, Europe

The Sunken Rock Hewn church of Bet Giyorgis (St George), Lalibela, Northern Ethiopia, Ethiopia, Africa *** Local Caption *** The most famous of Lalibela's Rock Hewn churches, The Sunken Rock Hewn church of Bet Giyorgis, 'St. George', dating from the 12th Century, Lalibela's Rock Hewn Churches rank amoung the greatest religio-historical sites, not only in the African continent but in the Christian World

U-bahn subway station sign in new urban development in Potsdamer Platz, Berlin, Germany, Europe

Greenwich Foot Tunnel, interior, Greenwich, London, England, United Kingdom, Europe

Soviet-era nuclear bunker, central Tirana, Albania, Europe

Postojna Caves, Postojna, Slovenia, Eastern Europe

Copper mines in the former French mining town of Santa Rosalia, Baja California Sur, Mexico, North America

Derinkuyu underground massive city arches structure in Cappadocia, Turkey

The Agape Table, St. Pauls catacombs, Rabat, Malta

Basilica Cistern columns, Istanbul, Turkey, Europe

Basilica Cistern with green illumination, Istanbul, Turkey, Europe

Basilica Cistern with an orange illumination, Istanbul, Turkey, Europe

An El train on the Elevated train system crossing Wells Street Bridge, Chicago, Illinois, United States of America, North America

Paternoster Vents Ventilation Structure for Underground Electricity Substation, designed by Thomas Heatherwick Studios, Paternoster Square, City of London, London, England, United Kingdom, Europe

Portrait of serious Caucasian woman at train station

Dubai, UAE - 11.3.2022: Dubai Metro rail with skyscrapers and Museum of the Future in Dubai in the frame. Dubai Cityscape skyline with modern urban transit system

Monastery church of Panagia Agrilia, abandoned cave dwellings in erosion valley, panoramic view, island of Thirassia, archipelago of Santorini, Cyclades, Greece

Tourists and commuters navigating an underground corridor in London, united kingdom, surrounded by modern architecture and vibrant energy

Motion blur of a London underground train arriving at Camden town station with its distinctive tiled walls and roundel

Bronze statue of the late singer Amy Winehouse, standing proudly in stables market, Camden town, London

Young multi ethnic couple walking together with luggage at a train station platform, enjoying their vacation

Ik Kil, Mexico, 20 December, 2019: Ik Kil Cenote located in the northern center of the Yucatán Peninsula, a part of the Ik Kil Archeological Park near Chichen Itza, Central America

Tourist stands inside the arc natural cave in portocolom, mallorca, admiring the scenic view of a lighthouse across the blue waters

Semi-subterranean temple, Tiwanaku, Bolivia, South America

La Cova Foradada cave at the Far de Cap de Barbaria lighthouse on the southern tip of Formentera, Balearic Islands, Spain, Europe

Westfriedhof, underground station, modern architecture, Munich, Germany, Europe

Westfriedhof, underground station, modern architecture, Munich, Germany, Europe

Entrance gate and altar, Mary's Grotto, replica of the Grotto of Lourdes, place of pilgrimage, Bad Salzschlirf, Vogelsberg and Roehn, Fulda, Hesse, Germany, Europe

Westfriedhof, underground station, modern architecture, Munich, Germany, Europe

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

Silhouette of the man in underground tunnel

Empty stairs in underground tunnel

Empty stairs in underground tunnel

Train entering the subway station

Blurred train in movement on the subway station

Paradise Garden with Garden Grotto, Neuburg am Inn Castle, Neuburg am Inn, Lower Bavaria, Bavaria, Germany, Europe

Rocky landscape with ancient rock structures under a clear blue sky in Cappadocia, aerial view, Uchisar Castle, Uçhisar Kalesi, impressive rock formation and fortress, Göreme National Park, Göreme Tarihî Millî, Nevsehir Province, Nevşehir, Cappadocia, Cappadocia, Kapadokya, Cappadocia, Central Anatolia, Turkey

Cave architecture along an elongated rock formation, embedded in a green natural backdrop with road, aerial view, cave town, cave monastery, Vardzia, Vardzia, Samtskhe-Javakheti region, Samtske Javakheti, Lesser Caucasus, Georgia

Caves lined up in a massive rock face, surrounded by green areas, aerial view, cave town, cave monastery, Vardzia, Vardzia, Samtskhe-Javakheti region, Samtske Javakheti, Lesser Caucasus, Georgia

Historic architecture with bells and arcades, embedded in rocky structures, aerial view, Church of the Assumption, cave town, cave monastery, Vardzia, Vardzia, Samtskhe-Javakheti region, Samtske Javakheti, Lesser Caucasus, Georgia

Cosy cave dwelling with rustic style and furniture, surrounded by plants and rocky surroundings, aerial view, inhabited monk caves, cave town, cave monastery, Vardzia, Vardzia, Samtskhe-Javakheti region, Samtske Javakheti, Lesser Caucasus, Georgia

Ancient cave city with branching paths and stairs embedded in the rocky landscape, aerial view, cave city, cave monastery, Vardzia, Vardzia, Samtskhe-Javakheti region, Samtske Javakheti, Lesser Caucasus, Georgia

Chichen Itza Kukulcan Mayan Pyramid new underground excavation discoveries

Ventilation pipes of the underground car park, and Cinedom cinema, modern architecture in snow and ice, Mediapark, Cologne, Rhineland, North Rhine-Westphalia, Germany, Europe

Princess cave at Phra Nang beach near Krabi, fertility, fertility temple, penis, dildo, penis grotto, phallus, phallus symbol, symbol, religion, pilgrimage site, faith, superstition, place, pilgrimage, Buddhism, Buddhist, cave, statues, sculpture, replica, Eros, symbolic, tradition, traditional, pilgrimage, travel, tourism, culture, figure, Krabi, Thailand, Asia

Temple in a stalactite cave, Phraya Nakhon Cave, Khao Sam Roi Yot National Park, Hua Hin, Prachuap Khiri Khan, Thailand

Stone and turf structure with wooden doorway at the recreated longhouse in Greenland's Brattahlid, Eriksfjord area, part of a reconstruction of Erik the Red's settlement, Kujataa World Heritage Site, Qassiarsuk, Southern Greenland, Greenland

St. Patrick&7;S Well, Orvieto, Umbria, Italy

St. Patrick&7;S Well, Orvieto, Umbria Italy