© Istockphoto| Arco di Aloba, Ciad  

© Istockphoto| Delicate Arch, Utah, Usa 

© Istockphoto| Rainbow Bridge, Arizona, Usa

© Istockphoto| Pedra Furada, Serra da Capivara, Brasile

© Istockphoto| Moon Hill, Cina 

© Istockphoto| Pravcicka Brana, Repubblica Ceca

© Istockphoto| Monte Forato, Alpi Apuane, Lucca

© Istockphoto|  Timna Park, Israele 

© Istockphoto|Hajducka Vrata, Bosnia 

© Istockphoto| Pont D'Arc - Vallon, Francia