How wide was the pass at Thermopylae?
921537
Finally a great question but difficult to answer the pass is now a different size and is a major tourist draw.  Here is one of the earliest descriptions of size:  "At the time, the mountain pass of Thermopylae consisted of a pass so narrow that two chariots could barely move abreast—on the western side of the pass stood the sheer side of the mountain, while the east side was the sea. Along the path was a series of three «gates», and at the center gate a short wall that had been erected by the Phocians in the previous century to aid in their defense against Thessalian invasions". \n\n\nGod Bless You and The Southern People
588922
it was a little nippy going throught the pass huh hare?
393529
567.95 miles\ni looked it up on map quest
44682
Genghis Khan kingdom covered the widest geographical areas in human history. But I am not sure how long it lasted. Hope this answers your question.
771272
Across the Bering Strait. The strait is approximately 90 km (56 mile) wide. In March, 2006, Briton Karl Bushby and French American adventurer Dimitri Kieffer crossed the strait on foot, walking across a frozen 90 km (56 mile) section in 15 days. (BBC) (although they were soon arrested for not entering Russia through a border control.)
151326
480 BC, the Persians won it but were delayed so that Athens was evacuated...\nIn the Battle of Thermopylae of 480 BC an alliance of Greek city-states fought the invading Persian army in a mountain pass. Though vastly outnumbered, the Greeks held back the Persian advance in order to buy time for the evacuation of Athens and the preparation of a greater Greek fighting force. Leonidas, the Spartan King commanding the army, held up the enemy in one of the most famous last stands of history. Its loss gave the Persians control as far as the Isthmus of Corinth, and the opportunity to sack Athens. However they were later defeated at the battles of Salamis and Plataea, ending their invasion of Greece.
870893
90-120 metres long and 45-90 metres wide. See more details at the link below.
6138
2,549 Meters (8,364 feet (9,677 feet before May 18, 1980))
24424
3,776 metres (12,388 feet)
1094774
62 miles (100 km), also known as the Karman Line - http://en.wikipedia.org/wiki/Karman_line
796546
All the dimensions given in Plato's account of Atlantis are approximately 10 times the size of Crete.  Its distance from Egypt is about 10 times the distance of Crete, too, and the date of its destruction is 10 times longer ago than the volcanic eruption and tidal wave which probably destroyed Minoan Crete in 1500 BC.\n\nIt is very plausible that when Solon got this story from an Egyptian priest, he mistranslated the numbers, and Plato just copied them, which would have put Atlantis beyond the pillars of Hercules instead of just south of Greece.
272895
65 miles long averaging one to two miles in width
70885
It's not much, but I found this:\nhttp://www.infoeck.at/content/europa/panorama_2005_jb_tolerance.htm
315669
One thing to keep in mind...the speed limit on the Trace is 50. It is pretty scenic. Lots of historic sites. Expect to see lots of wildlife (turkey, deer, etc.). Camping in May could get hot, but not unbearable. I live in Jackson, there are a few things to do. Old capitol museum, golf, Ross Barnett Reservoir, good food. Depending on when in May you are coming, there are some good concerts.
784620
About 320 metres. And the "keyhole" it would have to pass through to be diverted onto a collision course is only 400 metres wide so it would have to hit it plumb centre.\n\nBased upon the observed brightness, 99942 Apophis's length was originally estimated at 415 m (1350 ft); a more refined estimate based on spectroscopic observations at NASA's Infrared Telescope Facility in Hawaii by Binzel, Rivkin, Bus, and Tokunaga (2005) is 320 metres (1050 feet). Its mass is estimated to be 4.6×10^10 kilograms.\n\nApophis belongs to a group called the "Aten asteroids", asteroids with an orbital semi-major axis less than one astronomical unit. This particular one has an orbital period about the Sun of 323 days, and its path brings it across Earth's orbit twice on each passage around the Sun.\n\nApophis was originally known by its provisional designation 2004 MN4. When its orbit was sufficiently well calculated it received the permanent number 99942 (on June 24, 2005).  Receiving a permanent number made it eligible for naming, and it promptly received the name "Apophis" as of July 19, 2005. Apophis is the Greek name of the Ancient Egyptian god Apep, "the Destroyer", who dwells in the eternal darkness of the Duat (underworld) and tries to destroy the Sun during its nightly passage.\n\nFrom your other question it is clear that you are concerned about the possibility of an impact and how devastating that might be.\n\nWIKIPEDIA ASSESSES THESE AS FOLLOWS \n\nPossible impact effects\n\nIt must be stressed that the odds of impact are now known to be very low. Hence, the possible effects of an impact are largely irrelevant.\n\nHowever, the initial reports resulted in widespread discussion on many Internet forums, including armchair speculation about exactly where Apophis (then known only as 2004 MN4) would hit and what would happen when it did.\n\nNASA initially estimated the energy that Apophis would have released if it impacted Earth as the equivalent of 1480 megatons of TNT. A more refined later NASA estimate was 880 megatons. The impacts which created the Barringer Crater or caused the Tunguska event are estimated to be in the 10-20 megaton range. The 1883 eruption of Krakatoa was the equivalent of roughly 200 megatons.\n\nThe exact effects of any impact would have varied based on the asteroid's composition, and the location and angle of impact. Any impact would have been extremely detrimental to an area of thousands of square kilometres, but would have been unlikely to have long-lasting global effects, such as the initiation of an impact winter.\n\n===\nMY COMMENTS AGAIN:\n\nThe bigger threat is in 2880 and is from asteroid 29075 1950 DA. It is 4 times the diameter and thus ~64 times the volume of Apophis. Potentially more damaging consequences, therefore. If there were to be an impact.\n\nRadar observations at the Goldstone and Arecibo Observatory from March 3 to 7, 2001 during the asteroid's 7.8 million km approach to the Earth give a mean diameter of 1.1 – 1.4 km. Optical lightcurves by Petr Pravec show that the asteroid rotates every 2.1216 hours.\n\nDue to its short rotation period, 1950 DA is thought to be fairly dense (more than 3.0 g/cm³).\n\nIf 1950 DA continues on its present orbit, it will approach near to the Earth on March 16, 2880. Over the intervening time, the rotation of the asteroid will cause its orbit to change (by the Yarkovsky effect). A preliminary analysis shows two possible pole directions (Giorgini, et al., 2002 "Asteroid 1950 DA's 2880 Encounter with Earth"). One trajectory misses the Earth by tens of millions of kilometers, while the other has an impact probability of 1⁄300. The radar observations are currently being reanalyzed, in combination with the optical lightcurves.\n\nThe energy released by a collision with an object the size of 1950 DA would cause major effects on the climate and biosphere which would be devastating to human civ
736764
roman aquiducts or the colluseam and greek temples (the parthenon)
88670
663,267 mi² / 1 717 854 km².