Poenari Castle on Mount Cetatea, Făgăraș Mountains, Romania (© porojnicu/Getty Images)

Delicate Arch, Arches National Park, Utah (© Mark Brodkin Photography/Getty Images)

Gray seal pup, Lundy Island, England (© Henley Spiers/Minden Pictures)

Royal azaleas in bloom on Hwangmaesan Mountain, South Korea (© Stock for you/Shutterstock)

Church of Nuestra Señora de los Remedios and Popocatépetl, Puebla, Mexico (© Radius Images/Shutterstock)

Mayan ruins in Tikal, Guatemala (© THP Creative/Getty Images)

Wildebeests in the Maasai Mara National Reserve, Kenya (© Matt Polski/Getty Images)

Jöriseen lakes in the Silvretta Alps, Switzerland (© Florin Baumann/Getty Images)

Korean Bell of Friendship, Los Angeles (© Carlos Marin/Getty Images)

Preservation Hall, New Orleans, Louisiana (© Cosmo Condina North America/Alamy)