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**Title:** Top 10 Scenic Highway Routes in Bulgaria

**Content Summary (1200 words):**
- Introduction to Bulgaria's diverse landscapes
- Route 1: Sofia to Varna Coastal Drive
- Route 2: Rila Mountain Pass
- Route 3: Black Sea Coastal Highway
- Route 4: Rhodope Mountains Loop
- Route 5: Danube River Highway
- Route 6: Thracian Valley Wine Route
- Route 7: Pirin National Park Access
- Route 8: Sofia to Plovdiv Historic Route
- Route 9: Northern Bulgaria Plains
- Route 10: Eastern Border Mountain Roads
- Best seasons for each route
- Photography tips and scenic stops
- Vignette coverage for all routes
- Accommodation recommendations