In a quarry at Aswan lies an unfinished obelisk, the largest the ancient Egyptians ever attempted. It’s 137 feet long and weighs more than 1,000 tons, more than two jumbo jets or 200 African elephants. If it had been completed it would have weighed more than twice as much as any other obelisk that the Egyptians ever erected. Cracks appeared in the granite before workers could carve it from the bedrock, so the project was abandoned.

“The obelisk is so large that it makes a cameo appearance in Cecil B. DeMille’s 1923 silent film The Ten Commandments,” writes Egyptologist Bob Brier in Cleopatra’s Needles (2021). “In one scene we see Israelites toiling under the whip of a cruel taskmaster, pulling a large block of stone up an inclined ramp. That incline is the unfinished obelisk!”

Deposition of Elizabeth Brett, a Hertfordshire farmer’s servant, regarding an alarming experience on Sept. 15, 1784:

This deponent, on her oath, saith, that on Wednesday the 15th day of September instant, between four and five o’clock in the afternoon, she, this deponent, being then at work in her master’s brewhouse, heard an uncommon and loud noise, which, on attending to it, she conceived to be the sound of men singing as they returned from harvest-home. That upon going to the door of the house she perceived a strange large body in the air, and, on approaching it in a meadow-field near the house, called Long Mead, she perceived a man in it; that the person in the machine, which she knew not what to make of, but which the person in it called an air-balloon, called to her to take hold of the rope, which she did accordingly; that John Mills and George Philips, labourers with said Mr. Thomas Read, came up soon after, and, being likewise requested to assist in holding the rope, both made their excuses, one of them, George Philips, saying he was too short, and John Mills saying that he did not like it; that this deponent continued to hold the rope till some other harvest-men of Mr. Benjamin Robinson, of High Cross, came up, by whose assistance the machine was held down till the person got out of the machine. And this deponent further, on her oath, saith, that the person now present and shown to her by William Baker, Esq., the justice of peace before whom this deposition is taken, as Mr. Vincent Lunardi, and in her presence declares himself to be Mr. Vincent Lunardi, was the person who called to me from the machine, as above stated, and who descended therefrom in the said field called Long Meadow.

Other witnesses acknowledged that Lunardi had told them “that he had set out from the Artillery Ground in London, a little before two o’clock in the afternoon of the said day, in the machine, and had travelled through the air to the place where they found him.” He later described his view of the city from this new perspective.

From Christopher H. Turnor’s Astra Castra, 1865, via Humphrey Jennings, Pandaemonium, 1985.

Natural philosopher John Wilkins’ Mathematical Magick of 1648 contains a startling passage in which he foretells the advantages of a long-range submarine, or “ship, wherein men may safely swim underwater”:

1. ‘Tis private; a man may thus go to any coast of the world invisibly, without being discovered or prevented in his journey;
2. ‘Tis safe; from the uncertainty of Tides, and the violence of Tempests, which do never move the sea above five or six paces deep. From Pirates and Robbers which do so infest other voyages; from ice and great frosts, which do so much endanger the passages toward the Poles.
3. It may be of very great advantage against a Navy of enemies, who by this means may be undermined in the water, and blown up.
4. It may be of a special use for the relief of any place that is besieged by water, to convey unto them invisible supplies: and so likewise for the surprisal of any place that is accessible by water.
5. It may be of unspeakable benefit from submarine experiments and discoveries.

Wilkins was aware of Cornelius Drebbel’s primitive sub of 1620, but he looks much farther ahead, seeming to foresee combat submarines and deep-sea exploration vessels.

“I am not able to judge what other advantages there may be suggested, or whether experiment would fully answer to these notional conjectures,” he concluded. “But however, because the invention did unto me seem ingenious and new, being not impertinent to the present enquiry, therefore I thought it might be worth the mentioning.”

(From Joseph J. Thorndike Jr., ed., Mysteries of the Deep, 1980.)

In July 1977 geomorphologist Peter Johnson stumbled across an old weather station in northern Labrador. It turned out to be an automatic station that had been set up secretly by a German submarine crew in 1943 so that Germany might have notice of impending weather systems. The Allies had never discovered it and it had stood unregarded for 30 years after the war’s end.

“Weather Station Kurt” was probably designed to operate automatically for about six months, transmitting readings on temperature, wind direction, strength, and humidity every three hours until its batteries failed in the cold.

All the witnesses to its installation died when the submarine, U-537, was sunk in the Java Sea. Their work marks the only known armed German military operation on land in North America during World War II.

The station is now on display at the Canadian War Museum.