Rome, the capital of Italy, was built on seven hills: Aventine, Caelian, Capitoline, Esquiline, Palatine, Quirinal, and Viminal.

Machu Picchu is an ancient city located in the Andes Mountains of Peru. It was built by the Inca Empire in the 15th century and was abandoned about 100 years later.

Machu Picchu is often referred to as the 'Lost City of the Incas' due to its remote location and the fact that it was abandoned and forgotten for centuries.

Petra is an ancient city located in Jordan that was carved into sandstone cliffs by the Nabataeans. It was a major trading center in the ancient world.

Angkor Wat is a temple complex located in Cambodia that was built in the 12th century. It was the capital of the Khmer Empire and is one of the most popular tourist destinations in Southeast Asia.

Chichen Itza is an ancient city located in Mexico that was built by the Maya civilization. It was a major political and cultural center in the Maya world.

The Olmec Heads are a series of large stone heads that were created by the Olmec civilization in Mexico. They are believed to represent rulers or gods and are one of the most iconic symbols of ancient Mesoamerica.

Xi'an was the capital of the Qin dynasty, which ruled China from 221 to 206 BC. It is home to the famous Terracotta Army, which consists of thousands of life-sized terracotta figures that were buried with the first emperor of China, Qin Shi Huang.

Sacsayhuaman is an ancient fortress located in Cusco, Peru. It was built by the Inca civilization and is known for its massive stone structures, including the famous zigzag walls.

Constantinople was the capital of the Byzantine Empire from 330 to 1453. It is now known as Istanbul, Turkey.

The Acropolis is an ancient citadel located in Athens, Greece. It is home to some of the most iconic ancient Greek structures, including the Parthenon and the Temple of Athena Nike.

Thebes was the capital of ancient Egypt during the New Kingdom period (1550-1070 BC). It was home to many temples and tombs, including the famous Valley of the Kings.

The Giza Pyramids are a complex of ancient Egyptian pyramids located near Cairo, Egypt. They include the Great Pyramid of Giza, which is the largest pyramid in the world.

Delhi was the capital of the Mughal Empire from 1526 to 1857. It is home to many historical sites, including the Red Fort and the Jama Masjid.

The Taj Mahal is a white marble mausoleum located in Agra, India. It was built by the Mughal emperor Shah Jahan in memory of his wife, Mumtaz Mahal.