Iran is home to more than 3,000 species of lichens, with 500 to 700 varieties growing on historical monuments, Sohrabi said, noting that some at Persepolis were over 1,700 years old.

Since 1979, Persepolis has been a UNESCO World Heritage Site. It features massive sculptures and complex carvings of ancient Persian kings, nobles, and deities.

Why was the country of Iran formerly called Persia? What has this got to do with the conquests of ancient Middle Eastern ...

Conservationists at Persepolis, Iran's most iconic ancient site, are waging a delicate battle against an unlikely adversary: tiny but persistent lichens eroding the millennia-old monuments.The fight, ...

Conservationists at Persepolis, Iran's most iconic ancient site, are waging a delicate battle against an unlikely adversary: tiny but persistent lichens eroding the millennia-old monuments.

Iran is home to more than 3,000 species of lichens, with 500 to 700 varieties growing on historical monuments, Sohrabi said, noting that some at Persepolis were over 1,700 years old.

PERSEPOLIS, Iran – Conservationists at Persepolis, Iran's most iconic ancient site, are waging a delicate battle against an unlikely adversary: tiny but persistent lichens eroding the millennia-old ...

PERSEPOLIS, Iran — Conservationists at Persepolis, Iran's most iconic ancient site, are waging a delicate battle against an unlikely adversary: tiny but persistent lichens eroding the millennia-old ...

"It is the foundation of Iran's history, culture and socio-cultural life." A UNESCO World Heritage Site since 1979, Persepolis features colossal sculptures and intricate stone reliefs of ancient ...