History can be told in terms of secret passageways, hidden rooms, and obscure tunnels. Wars have been won and lost by them, coup d’états sprung, and entire countries altered thanks to a well-placed nook or crannie. There are also plenty of modern-day uses, as you’ll see below—from drug smuggling tunnels in Tijuana to hidden doors that protect your most valuable wines. Check out 20 of the best, below.

Source: gizmodo.com