Explanation:

- The Kachari Ruins are a series of ancient megalithic ruins comprising monoliths, remnants of buildings, and other structures.

- Option 2: Dimapur - You will find the Kachari Ruins in Dimapur, located in the state of Nagaland, India. These ruins date back to the 10th century and are associated with the presence of the ancient Kachari Kingdom.

- Option 1: Bilaspur - This is a city in the central part of India known for its cultural sites but not related to the Kachari Ruins.

- Option 3: Shimla - It is a hill station in Himachal Pradesh, famous for its colonial architecture, not for ancient ruins like the Kachari Ruins.

- Option 4: Gangtok - This is the capital of Sikkim and known for its Buddhism and mountain views, not related to the Kachari Ruins.

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