Ashtown is a fictional location featured in the book series "The 39 Clues." It is depicted as a mysterious and ancient city, rich in history and secrets. The city serves as a backdrop for various adventures and challenges faced by the characters as they search for clues related to the Cahill family and their powerful legacy. In the series, Ashtown is known for its unique architecture and hidden treasures, which reflect its long-standing significance in the Cahill storyline. The city plays a crucial role in the characters' quest, providing both obstacles and opportunities as they navigate through its intriguing landscape.