Megalith (noun)

1. A large stone structure, such as a monument, tomb, or temple, typically built in prehistoric times.
2. A large stone block used in the construction of buildings or monuments.

Origin:

The word megalith comes from the greek μέγας (megas), meaning 'large', and λίθος (lithos), meaning 'stone'. it was first used in the 19th century to describe large stone structures built by ancient civilizations.

Examples:

1. The megaliths at Stonehenge are among the most famous prehistoric structures in the world.
2. The megalithic tombs of the Neolithic period are some of the earliest examples of monumental architecture.
3. The ancient city was surrounded by megaliths and other stone structures.
4. The megaliths of the ancient temple were so heavy that they could only be moved with the help of hundreds of workers.
5. The megalithic monuments of Easter Island are among the most mysterious and intriguing structures in the world.