You may not be able to name all, or even most, of the seven wonders of the ancient world. But you almost certainly know that there were seven of them. In a way, that aligns well enough with the worldview of the Greeks who first made reference to such a list, given their near-reverence for that number. Seven were the strings of the lyre (unless there happened to be eight or nine), seven were the gates of Thebes, and seven were the “wandering stars” in the night sky (if you count the sun and moon). The identity of the wonders was less important than the length of their list, and indeed, as ancient-history YouTuber Garrett Ryan explains in his Told in Stone video above, additions and changes were proposed since the beginning.The classic seven-wonders roster includes the Hanging Gardens of Babylon, the Statue of Zeus at Olympia, the Temple of Artemis at Ephesus, the Mausoleum at Halicarnassus, the Colossus of Rhodes, the Lighthouse of Alexandria, and the Great Pyramid of Giza, that last being the only one still in existence today.Ryan’s alternative list includes the Egyptian labyrinth at Hawara, which Herodotus considered superior even to the Pyramids; the Temple of Zeus at Cyzicus, which Pliny the Elder described as lined by gold tubes to let in the sunlight (surely stripped out as soon as the place fell into disuse); the sewers of Rome, a civilizational achievement unto themselves; and the Theater of Scaurus, which, though constructed out of wood for temporary use, seated an astonishing 80,000 people.Ryan completes his seven other wonders with the Altar of Horns at Delos, held in myth to have been built by Apollo himself; the Walls of Babylon, which actually appear on the earliest known version of the list; and, finally, the good old Colosseum. As over-familiar (not to mention over-toured) as it may be, the Flavian Amphitheater, as the Colosseum was known in its day, does make for a welcome presence among the ancient wonders, being the only other one apart from the Great Pyramid that we can still visit today. But if you get into the mood to go marvel at thaumata, to borrow the Greek word, by no means limit yourself to selections already curated by others. The world is full of wonders, and your own personal seven may not be far away.Related content:Watch Ancient Ruins Get Restored to their Glorious Original State with Animated GIFs: The Temple of Jupiter, Luxor Temple & MoreA Walking Tour Around the Pyramids of Giza: 2 Hours in Hi DefTen Lost Roman Wonders: The World’s Longest Tunnel, Tallest Dam, Widest-Spanning Bridge & MoreHow the Ancient Greeks Built Their Magnificent Temples: The Art of Ancient EngineeringTake a Virtual Tour of Machu Picchu, One of the New 7 Wonders of the WorldThe Ancient World Comes to Life in an Animation Featuring Istanbul’s Islamic, Ottoman, Greek & Byzantine ArtBased in Seoul, Colin Marshall writes and broadcasts on cities, language, and culture. He’s the author of the newsletter Books on Cities as well as the books 한국 요약 금지 (No Summarizing Korea) and Korean Newtro. Follow him on the social network formerly known as Twitter at @colinmarshall.