Cambodia has a long history. It has both a proud past and a tragic history. The country had its period of greatness during the ancient Khmer Empire, an empire which built the fabled temple Angkor Wat, one of the seven wonders of the world. Following the Angkorian era which began at the beginning of the 9th century and collapsed 600 years later, Cambodia found itself in one of the most tragic periods in its history. For almost 500 years, the country came under the enduring pressure of foreign invasion and annexation. Both Thailand and Vietnam, its stronger neighbors, annexed large parts of Cambodian territory.