The term "Pantheon" can refer to several famous structures, and it seems you are asking about specific ones located in Paris, Athens, and London. Here are the details:
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Pantheon in Paris, France: The Panthéon is a mausoleum located in the Latin Quarter of Paris. It was originally built as a church dedicated to St. Genevieve and now contains the remains of distinguished French citizens.
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Pantheon in Athens, Greece: While not referred to explicitly as a Pantheon, the most famous structure in Athens is the Parthenon, which is a temple dedicated to the goddess Athena. However, if you are looking for a Pantheon in the traditional sense, there isn't a specific "Pantheon" in Athens like there is in Rome.
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Pantheon in London, England: There is no specific structure known as a Pantheon in London. However, the architectural term is sometimes informally used to describe structures with similar features. The closest reference could be to St. Paul's Cathedral, which has a dome reminiscent of classical Pantheons.
If you meant the famous Pantheon in Rome, Italy, it is indeed a well-known structure that was originally built as a temple for all Roman gods and is a prime example of ancient Roman architecture. If you're seeking information about other specific structures or different cities, please clarify!