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Capitalize all country and city names in this travel article.

Relevant data:
Greece is a popular travel destination that offers a mix of history, culture, and natural beauty. Athens is the capital city of Greece, and it has many historically significant landmarks such as the Acropolis and the Parthenon. Santorini is a small island in the Aegean Sea and is known for its stunning sunsets and white-washed buildings.
gpt
Greece is a popular travel destination that offers a mix of history, culture, and natural beauty. Athens is the capital city of Greece, and it has many historically significant landmarks such as the Acropolis and the Parthenon. Santorini is a small island in the Aegean Sea and is known for its stunning sunsets and white-washed buildings.