We've all heard of the Seven Wonders of the Ancient World.
But where are they? Who built them and why? Were they even real?
Well, the first thing is that the idea of "Seven Wonders" is itself 2,000 years old...
So, the idea of "Seven Wonders" is older than you might imagine.
As long ago as 60 BC Diodorus of Sicily listed them, and even before that there was a trend of describing the great monuments of the world, as Herodotus did in the 5th century BC when he wrote of Babylon and Egypt.
But the canonical "seven" that has been handed down (which focusses mainly on Greek or Hellenistic buildings) was actually established by Antipater of Sidon in around 100 BC.
For over two thousand years they have indeed been considered, as a group, wonders of the world...
1. Great Pyramid of Giza
Perhaps the world's most famous building; it has held sway over our imaginations for millennia.
The Great Pyramid is astonishingly old. There's a greater span of time between its construction and the birth of Jesus than his birth and the present day.
It was built in about 2,700 BC on the orders of the Pharaoh Khufu, to be both his tomb and a monument to his semi-divine rule for all time.
So it is by far the oldest of the Seven Wonders, not so distant from the birth of human civilisation itself.
The Great Pyramid was the world's tallest building for nearly 4,000 years. And what we see today is really just the inner structure - it was once clad in shimmering white limestone.
2. Hanging Gardens of Babylon
The most controversial of all the ancient wonders. Nobody agrees about whether it really existed, and - even if it did - where it was or what it looked like.
The original theory is that King Nebuchadnezzar II built it in the 6th century BC.
The Mesopotamians built ziggurats - large tiered temples - all across modern-day Iraq.
When the Ziggurat of Ur (an ancient Sumerian city) was excavated in the 1920s, archaeologists noticed that it had a complex irrigation system, suggesting it once featured raised gardens.
And so the "Hanging Gardens" may have looked something like this.
As for its real location: who knows? But it entered the realm of quasi-historical myth and has been subject to endless fanciful retellings and theorisations down the centuries.
A half-real wonder, perhaps.
3. Statue of Zeus at Olympia
This statue was forty feet tall, made from ivory and gold over a wooden frame, and stood in the Temple of Zeus at Olympia, in Greece.
Zeus was King of the Gods, after all, and so he deserved the ultimate sanctuary of worship.
It dates to 435 BC.
The statue's creator was Phidias, famed as the greatest of all Ancient Greek sculptors: he also made the Parthenon Friezes.
The statue's fate is uncertain, though the temple itself fell into disuse when the Roman Emperor Theodosius banned pagan worship in the 4th century AD.
Phidias also made the Statue of Athena which once stood inside the Parthenon, in Athens.
Like the Statue of Zeus it was colossal and - to our surprise - colourful. Our view of Greek statues as pure white marble is inaccurate; they were originally brightly painted or decorated.
4. Temple of Artemis at Ephesus
It had three different versions. The oldest was a Bronze Age shrine, the second was built on a larger scale in the 6th century, and the wonder itself was built in the 4th century BC, dedicated to a local, quasi-Egyptian version of the goddess.
Where is Ephesus? It's an ancient city in what is now Western Anatolia, in Turkey.
This is an important reminder that what we call "Ancient Greece" was really a loose collection of cities and communities spread right across the Eastern Mediterranean.
The third Temple of Artemis was - like many pagan shrines - destroyed once and for all in the 5th century AD, having first been closed down as the Roman Empire embraced Christianity and cracked down on paganism.
A watershed moment, given the former greatness of this temple.
5. Mausoleum at Halicarnassus
This tomb was built in about 350 BC for Mausolus, the ruler of a region in Western Anatolia called Caria, by his wife Artemisia.
It's from Mausolus' tomb that the word mausoleum itself originates.
It was situated in Halicarnassus (modern-day Bodrum in Turkey) which at that time was ruled by the Persian Empire.
And so Mausolus was a "satrap" - a type of Persian governor appointed by the king to rule a specific region. These satraps were minor kings in their own right.
Successive earthquakes destroyed the Mausoleum during the Middle Ages and its ruins used to built Bodrum Castle, though many of its original statues and friezes remain.
They were made by famous Greek artists and are a testament to the wealth and prestige Mausolus must have had.
6. Colossus of Rhodes
It was built in 280 BC by the people of Rhodes to celebrate the defence of their island against a long siege.
They melted their enemies' weapons and built the Colossus - a statue of the sun god Helios - from bronze and iron, somewhere near the harbour.
It never straddled the harbour entrace - that's a Medieval fantasy. But it was, so we are told, about 100 feet tall.
It fell during by an earthquake just fifty years later and was never rebuilt, though its ruins lay around for centuries.
Where are they now? Nobody knows.
7. Lighthouse at Alexandria
Known as "Pharos", it was built on a small island in about 250 BC by an architect called Sosistratus on the orders of King Ptolemy II Philadelphus of Egypt.
It was over one hundred metres tall, and we still don't know how its lantern worked.
Alexandria was founded by Alexander the Great in 331 BC after he conquered Egypt. It was his general Ptolemy who founded the Hellenstic kingdom of Egypt and built Alexandria to its fullest glory.
See, Alexandria was once the world's greatest city, and Pharos its crown jewel.
Alexandria not only became the world's largest city by population but was also a city of science and scholarship - hence the famous library.
It was also home to Hellenism, Graeco-Egyptianism, Judaism, Christianity, and (later) Islam; a city in the cultural cross-winds.
The Lighthouse was gradually worn by down by earthquakes over the centuries until it finally disappeared in the 1400s.
But its name - Pharos - is the origin of the word for lighthouse in Greek, French, Spanish, Portuguese, Bulgarian, and other languages. It lives on in spirit.
And they are the Seven Wonders of the Ancient World. Interesting by their own merits, but even more fascinating as windows into the past, into how the world once looked and worked but does no longer.
What other ancient structures deserve to be considered "wonders"?
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It features seven short lessons every Friday, including history, art, and architecture.
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The School of Athens, created by Raphael in 1511, is one of the world's most famous paintings.
But who are all these people in it?
The School of Athens is painted on the walls of the Apostolic Palace in the Vatican City, official residence of the Pope.
Raphael was initially commissioned by Pope Julius II to decorate his personal apartments. When Raphael died in 1520, the work was finished by his assistants.
This painting is so famous because it encapsulates the polymathic genius of the Renaissance, its embrace of the Classics and its humanist spirit.
Strange, perhaps, for a Catholic palace to feature such a profusion of pre-Christian thinkers. But that was the Renaissance.
This painting is called the Battle of Alexander at Issus, created by Albrecht Altdorfer nearly 500 years ago.
It's the 16th century equivalent of epic cinema - an entire film played out in a single, vast scene...
This extraordinary painting was commissioned by Duke William IV of Bavaria for his palace in Munich.
It depicts the Battle of Issus between Alexander the Great and Darius III of Persia in 333 B.C., which resulted in a Macedonian victory & paved the way for Alexander's conquests.
It is perhaps the supreme example of the "world landscape" style of painting, an unusual genre popular in the 15th and 16th centuries.
World landscapes show an enormous geographical scene, often with mountains and oceans, using unrealistic perspective and tiny human figures.
Possibly comes from the Latin phrase "io", which was an expression of joy. 14th century Medieval writers placed this at the end of sentences for emphasis. Eventually the I was placed above the O and it became an !
Got its current name in 1839.
Question Mark
One of the oldest punctuation marks going: indicating a question in writing is important. Some theorise that it's actually an abbreviation for the Latin word "quaestio", but no evidence for this.
"Form follows function" is a famous idea that makes us think of buildings with little or no ornamentation.
But Louis Sullivan, the man who came up with the phrase in 1896, designed buildings like the one below.
So what does "form follows function" actually mean?
Louis Sullivan (1856-1924) was an American architect whose career coincided with rapid population increase, economic growth, and a constant flow of new inventions.
This matrix had created the perfect conditions for somebody to establish a new form of architecture...
New construction methods and materials - such as cheap steel, reinforced concrete, and metal skeleton frames - had allowed for buildings on a scale previously inconceivable.
The skyscraper was possible... but it had never been before. So how was a skyscraper supposed to look?