The Great Wall of China is a series of fortifications built along China's northern borders to protect against invasions. The wall is made of brick, tamped earth, stone, and other materials and stretches over 13,000 miles. It was built over several centuries and is considered one of history's most impressive architectural feats.
The Pyramids of Egypt are a group of ancient structures that were built as tombs for pharaohs and their consorts. They are located in Egypt and are some of the most recognizable structures in the world. The largest pyramid is the Great Pyramid of Giza, which stands at over 450 feet tall.
Sigiriya is an ancient rock fortress located in Sri Lanka. It was built in the 5th century AD by King Kasyapa and is considered one of the most important archaeological sites in Sri Lanka. The fortress is located on top of a massive rock and features a series of gardens, frescoes, and other structures.