People have never been able to agree on the Seven Wonders of the medieval world, and this is just one of several lists that have been made. It includes buildings that were built before the medieval era - Stonehenge is even older than any of the ancient wonders - but excludes such buildings as Angkor Wat, Cambodia, the Taj Mahal, India, and Chichen Itza, Mexico, which were unknown to Europeans of the time.
Stonehenge
The famous circle of huge stones was built in stages from about 3000 BC. The origin of the stones, how they were transported (some of them weigh up to 50 tonnes) and the purpose of the site remain a mystery. It was possibly some sort of ancient observatory.
The Great Wall of China
This was a defensive wall designed to protect China from its warlike neighbours to the north. It was built in stages after 220 BC, using a huge labour force of as many as 300,000 workers. The main part is 3,460km long and wide enough for an army to march along it ten abreast
The Colosseum, Rome, Italy
This amphitheatre was opened in AD 80 with a huge spectacle lasting 100 days. It is oval in shape and measures 48m high, 188m long and 156m wide. It could hold up to 50,000 spectators and could even be flooded for re-enactments of sea battles.
The Catacombs of Alexandria (Kom El Shoqafa), Egypt
These unique Roman tombs beneath the city of Alexandria, Egypt, were discovered in 1900 when a donkey fell into the site. The beautifully preserved and richly carved catacombs had been tunnelled into solid rock during the 2nd century AD.
Hagia Sophia, Istanbul, Turkey
Hagia Sophia (Holy Wisdom). Istanbul, Turkey, was originally built in AD 360 by the Emperor Constantius. It was later rebuilt as one of the world's finest churches, with many mosaics and ornate details. In 1453 the church was converted into an Islamic mosque.
The Leaning Tower of Pisa, Italy
The building of the bell tower of Pisa cathedral began in 1173. Soon afterwards the foundations began to sink into the ground on one side. The design was adjusted, but by the time the tower had reached its full height of 55m it was leaning sharply. The tilt has increased over the centuries and it is amazing that the 14,000-tonne structure is still standing
The Porcelain Pagoda of Nanking, China
The Porcelain Pagoda was built in about 1412 by Emperor Yung-lo. It was an eight-sided structure covered in glazed tiles, and soared to 79m. It was destroyed during a rebellion in 1853.