This fortress withstood the English in the Hundred Years' War. It can withstand a few thousand zombies.

Strong Points: There's a five-sided tower with no blind angles, so you and your team can protect it from all directions. Built in a bay, its location will allow you to forage for supplies when the tide is low and sweep away the hordes when the tide comes in.

How it Could Fail: You may arrive to find the gift shop overrun with tourist zombies already.

Chance of Survival: 9/10. You are the Conwy castle group in World War Z.