Category:4th-century BC fortifications by country
Fortifications by country by century: (BCE) 7th century · 6th century · 5th century · 4th century · 3rd century · 2nd century · 1st century · (CE) 1st century · 2nd century · 3rd century · 4th century · 5th century · 6th century · 7th century · 8th century · 9th century · 10th century · 11th century · 12th century · 13th century · 14th century · 15th century · 16th century · 17th century · 18th century · 19th century · 20th century · 21st century ·
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