Europe:
* Italy (Rome specifically): This is where Dan Brown's "Angels and Demons" is set. The city's rich history, ancient secrets, and the Vatican's influence make it a natural choice. You could explore the city's hidden underground, secret societies, and the clash between ancient and modern.
* France (Paris): The City of Lights, with its iconic landmarks, mysterious catacombs, and history of secret societies, provides a great backdrop. You could delve into the secrets of the Louvre, the French Revolution, or even the connection between historical figures and the occult.
* Scotland: The Highlands, with their rugged landscapes, folklore of fairies and monsters, and long history of magic and witchcraft, offer a unique setting for a story of good versus evil.
Asia:
* India: With its ancient temples, rich mythology, and diverse religious beliefs, India is ripe for a story involving angels, demons, and ancient secrets. You could explore the clash between modern society and the ancient beliefs, or the struggles of a protagonist facing divine intervention.
* Japan: Japanese culture blends modern technology with ancient traditions, offering a unique blend of high-tech and mysticism. You could explore the legends of yokai (spirits and monsters), the influence of Shintoism and Buddhism, and the secrets hidden beneath modern Tokyo.
Other Options:
* Mexico: The Mayan and Aztec civilizations, with their intricate mythology and belief in gods and spirits, provide fertile ground for a story. You could explore the hidden mysteries of ancient temples, the conflict between ancient and modern beliefs, or the struggle of a character caught between two worlds.
* Egypt: The land of pharaohs, pyramids, and ancient gods, Egypt offers a setting where angels and demons could be interpreted as powerful beings from ancient mythology. You could explore the secrets of the tombs, the curses of the Pharaohs, or the hidden knowledge of the ancient Egyptians.
Things to Consider:
* Historical Context: Do you want to draw from existing mythology, historical events, or invent your own history?
* Characters: What kind of characters would fit the setting? Would they be deeply involved in the country's culture and history, or outsiders trying to understand it?
* Themes: What message do you want to convey? Will your story focus on the battle between good and evil, the clash of cultures, or the search for truth?
No matter which country you choose, be sure to research the history, culture, and mythology to create a compelling and believable story.