Customers queue to withdraw cash from automated teller machines (ATM) outside a main branch of the National Bank of Greece SA in Thessaloniki, Greece, on Monday, June 29, 2015. Greece shut its banks and imposed capital controls in an announcement designed to avert the collapse of its financial system, heightening the risk it will be forced out of the euro. Photographer: Kontantinos Tsakalidis/Bloomberg via Getty Images
