Step 1: Identify Davos's significance.
Davos is a town in Switzerland known for hosting a major international event.
Step 2: Match with known events.
The World Economic Forum (WEF), an annual meeting of global leaders to discuss economic issues, is held in Davos, making it famous for this event.
Step 3: Eliminate distractors.
(A) While Davos has tourism appeal, it is not the best-known tourist place in Switzerland (e.g., Zurich, Geneva).
(B) G8 meetings are not held in Davos annually (G7/G8 locations vary).
(C) EU financial headquarters are in Frankfurt, not Davos.
(E) Davos has ski resorts, but this is secondary to its WEF fame.
Therefore: The correct answer is (D). \[
\boxed{\text{D}}
\]