An emergency escape exit on a US Air force Hercules plane. Leading down The elegant crest of a

The elegant crest of a vast sand dune in shadow against a blue sky

A gilded bronze statue by the Potomac River featuring Mars on a horse

Iranian tourists visit the four tombs belonging to Achaemenid kings carved from the rock face at the archeological site of Naqsh-e Rustam also known as the Necropolis

Seeding clover heads carpet a farm field backlit by the rising sun

parapets and battlements and watch tower of a fort on a desert mountaintop

An emergency escape exit on a US Air force Hercules plane. Leading down The elegant crest of aAn emergency escape exit on a US Air force Hercules plane. Southern Ocean, between New Zealand and Antarctica.