Caves and tunnels have always been part of human life. We've grown more adept at shaping these underground shelters and passages over the millennia, and today we dig for hundreds of reasons. We excavate to find both literal and cultural treasures, digging mines, and unearthing archaeological discoveries. We use caverns for stable storage, for entertainment, and for an effective shelter from natural and man-made disasters. And as the planet's surface becomes more crowded, and national borders are closed, tunnels provide pathways for vehicles and smugglers of every kind. Collected below are more recent subterranean scenes from around the world. [ 28 photos total ]

Strong earthquakes in central Italy cause panic and fear among residents just two months after a quake nearby killed hundreds. [ 18 photos total ]

Mother Nature puts on an autumn show. [ 16 photos total ]

Benghazi University's graduating class of 2016 celebrate at the Libyan school's former headquarters, which were destroyed during clashes two years ago. [ 15 photos total ]

Our top photos from the past week. [ 21 photos total ]

Venezuela's increasingly militant opposition stepped up its push to remove leftist leader Nicolas Maduro with rallies that drew hundreds of thousands of protesters and calls for a general strike and march on the presidential palace. [ 20 photos total ]

Donald Trump and Hillary Clinton on the campaign trail today. [ 10 photos total ]

Photographers around the world capture colorful scenes of fall. Foliage transforms our landscapes into a sea of vibrant hues, as the seasonal light sets it aglow. [ 40 photos total ]

Iran has hosted a large refugee community for more than 30 years now as Afghans first fled the Soviet invasion, then the Taliban insurgency and now Islamic State attacks. [ 15 photos total ]

A small camp in Calais, France, housing nearly 8,000 migrants hoping to cross into England, is being evacuated and torn down in what French authorities are calling a “humanitarian” operation. The migrants, fleeing their homes in Africa and the Middle East, are being relocated from the camp known as “the Jungle” to centers across France. Some have decided they do not want to leave, and protests have resulted in fires burning through tents, trailers, shacks, and makeshift shops in the camp. The dismantlement operation is expected to last for a week. [ 32 photos total ]