Cu Chi Tunnels
This complex of underground tunnels is part of an extensive network that once ran under much of the country. Built by the Vietcong as part of the resistance to the U.S. military, these passageways allowed thousands of guerrillas to travel undetected for miles, carrying weapons, food and other supplies. A section of the tunnels is open to visitors: Have a go at wriggling through some of the narrow thoroughfares and try to imagine living in these cramped quarters. If you’re so inclined, head to the shooting range afterward to fire a variety of automatic weapons.