If you haven't thought twice already...

Travel alert for U.S. citizens, courtesy of CitizenInfo, Paris
(a service of the American Embassy)
Do not go to Yemen today.
They will not welcome you there.
Put off sailing around the Horn of Africa if you can help it,
with your sleek happy yacht full of expensive stuff.
A backpacking trek across wildest Iran is perhaps to avoid,
we cannot go saving you one by one.