Pilgrims wearing traditonal gabi (white shawl) at festival at rock-hewn monolithic church of Bet Giyorgis (St. George's), roof shaped like a Greek cross, Lalibela, UNESCO World Heritage Site, Ethiopia, Africa

Cross-shaped icon of Jesus hanging inside Santo Stefano religious complex, part of Sette Chiese (The Seven Churches), Bologna, Emilia Romagna, Italy, Europe

Pilgrims wearing traditonal gabi (white shawl) at festival at rock-hewn monolithic church of Bet Giyorgis (St. George's), roof shaped like a Greek cross, Lalibela, UNESCO World Heritage Site, Ethiopia, Africa

Pilgrims wearing traditonal gabi (white shawl) at festival at rock-hewn monolithic church of Bet Giyorgis (St. George's), roof shaped like a Greek cross, Lalibela, UNESCO World Heritage Site, Ethiopia, Africa

Pilgrims wearing traditonal gabi (white shawl) at festival at rock-hewn monolithic church of Bet Giyorgis (St. George's), roof shaped like a Greek cross, Lalibela, UNESCO World Heritage Site, Ethiopia, Africa

Rock-cut Christian church, Lalibela, UNESCO World Heritage Site, Ethiopia, Africa

"Totems, " installation art piece built from over 100 railroad ties by Basque artist Agustin Ibarrola on mining waste heaps near Bottrop, North Rhine-Westphalia, Germany, Europe

Off-road tour with cross-country vehicle in the Jordanian desert and mountains in the Wadi Rum National Park, Hashemite kingdom of Jordan, Middle East, Asia

Aerial view, Kamener Kreuz, a cloverleaf interchange, motorway junction, A1 motorway, A2 motorway, Hansalinie motorway, Kamen, Ruhrgebiet area, North Rhine-Westphalia, Germany, Europe

Aerial view, cross-shaped office building, Haskel Hochdrucksysteme high pressure systems GmbH, Wesel, Ruhrgebiet region, Niederrhein, North Rhine-Westphalia, Germany, Europe

Logo of the Bayer AG, a German chemical and pharmaceutical company

Entrance of the Kalivianis convent, orphanage, girl boarding school and retirement home, Crete, Greece, Europe

Cloister, Cathedral of Trier and Liebfrauenkirche church, Trier, Rhineland-Palatinate, Germany, Europe

Aerial view, Kamener Kreuz, a cloverleaf interchange, motorway junction, A1 motorway, A2 motorway, Hansalinie motorway, Kamen, Ruhrgebiet area, North Rhine-Westphalia, Germany, Europe

Bridge of the B37 highway at the railway station at dusk, cable-stayed bridge, Bahnhofbruecke, Ludwigshafen am Rhein, Rhineland-Palatinate, Germany, Europe

Bridge of the B37 highway at the railway station at dusk, cable-stayed bridge, Bahnhofbruecke, Ludwigshafen am Rhein, Rhineland-Palatinate, Germany, Europe

Camp in the rocky desert landscape at El Ghessour, Tassili du Hoggar, Wilaya Tamanrasset, Algeria, Sahara, North Africa

Off-road vehicle driving though a rock arch shaped by wind erosion, Acacus Mountains, Sahara desert, Libya, Africa

Aerial view, Kamener Kreuz, a cloverleaf interchange, motorway junction, A1 motorway, A2 motorway, Hansalinie motorway, Kamen, Ruhrgebiet area, North Rhine-Westphalia, Germany, Europe

Off-road vehicle in front of mountains, vast plains and red sand in the desert, Wadi Rum, Hashemite Kingdom of Jordan, Middle East, Asia

Vltava river, Charles Bridge, Smetana Museum in the former waterworks, Old Town Bridge Tower, water tower, dome of the Cross Church, Prague, Bohemia, Czech Republic, Europe

Cross-shaped stone opening in the underground Salt Cathedral of Zipaquira, Cundinamarca, Colombia, South America

Erasmusbruk, Bridge across the Nieuwe Maas, Rotterdam, Netherlands

Tourist cars on Tasset Plateau, Tassili n'Ajjer National Park, Unesco World Heritage Site, Wilaya Illizi, Algeria, Sahara, North Africa

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

Historic Beit ed-Dine, Beiteddine Palace of Emir Bashir, Chouf, Lebanon, Middle East, West Asia

Cross-shaped stone in the underground Salt Cathedral of Zipaquira, Cundinamarca, Colombia, South America

Erasmusbruk, Bridge across the Nieuwe Maas, Rotterdam, Netherlands

Aerial view, a roundabout, Unna, Ruhrgebiet area, North Rhine-Westphalia, Germany, Europe

Cloister, Cathedral of Trier and Liebfrauenkirche church, Trier, Rhineland-Palatinate, Germany, Europe

Off-road vehicle in rock landscape, Tasset, Algeria, Africa

Cloister, Cathedral of Trier and Liebfrauenkirche church, Trier, Rhineland-Palatinate, Germany, Europe

Cloister in Langenzenn, Middle Franconia, Franconia, Bavaria, Germany, Europe

Mortuary at the Cathedral, Eichstaett, Altmuehltal, Upper Bavaria, Bavaria, Germany, Europe

Historic caravanserai, Han, Khan al Franj, Sidon, Saida, Lebanon, Middle East, West Asia

Cloister, Cathedral of Trier and Liebfrauenkirche church, Trier, Rhineland-Palatinate, Germany, Europe

Rock formation, Tasset, Algeria, Africa

Cloister, Cathedral of Trier and Liebfrauenkirche church, Trier, Rhineland-Palatinate, Germany, Europe

The rock-hewn churches of Lalibela in Ethiopia. Pilgrim praying in front of a church. The churches of Lalibela have been constructed in the 12th or 13th century. They have been hewn from the solid rock and are considered to be one of the largest monolithic structures ever build by mankind, Africa, East Africa, Ethiopia, Lalibela

Standing Stones of Callanish (Callanish 1) on the Isle of Lewis in the Outer Hebrides. The megalithic monument is cross shaped with a central ring of stones and was buildt between 2900 and 2600 BC. It is probably oriented towards the moon not the sun. Europe, Scotland, July

Standing Stones of Callanish (Callanish 1) on the Isle of Lewis in the Outer Hebrides. The megalithic monument is cross shaped with a central ring of stones and was buildt between 2900 and 2600 BC. It is probably oriented towards the moon not the sun. Europe, Scotland, July

Standing Stones of Callanish (Callanish 1) on the Isle of Lewis in the Outer Hebrides. The megalithic monument is cross shaped with a central ring of stones and was buildt between 2900 and 2600 BC. It is probably oriented towards the moon not the sun. Europe, Scotland, July

Standing Stones of Callanish (Callanish 1) on the Isle of Lewis in the Outer Hebrides. The megalithic monument is cross shaped with a central ring of stones and was buildt between 2900 and 2600 BC. It is probably oriented towards the moon not the sun. Europe, Scotland, July

Standing Stones of Callanish (Callanish 1) on the Isle of Lewis in the Outer Hebrides. The megalithic monument is cross shaped with a central ring of stones and was buildt between 2900 and 2600 BC. It is probably oriented towards the moon not the sun. Europe, Scotland, July