Eindhoven University of Technology
Eindhoven University of Technology

Students Turn Leonardo da Vinci's Design Into the World's Longest Ice Bridge

Eindhoven University of Technology
Eindhoven University of Technology

Leonardo da Vinci wasn't just one of the greatest painters of his time. He was also known for having some pretty out there design ideas, including an expansive stone bridge that stretched across the Bosphorus River. Da Vinci never saw his concept come to life, but now a group of students is building the bridge—with a few adjustments. The final structure will be the world's longest ice bridge.

The team of researchers and students from the Eindhoven University of Technology in the Netherlands began construction on the project titled “Bridge in Ice” on December 28 in Juuka, Finland. Still, the final structure won't exactly be an icier version of da Vinci’s design. His model, made of stone, would have spanned 790 feet across the strait of Bosphorus that connects Europe to Asia. When this latest project is completed in mid-Feburary, the ice bridge will stretch 115 feet.

In order to ensure the material is sturdy enough, the engineers will combine paper fibers with water and spray that mixture onto massive inflated molds. Once frozen, the reinforced ice will be three times as strong as regular ice, strong enough to allow pedestrians to walk across. The team even plans to test the bridge's stability by driving a car over its surface.

To complete the project, the student engineers will need use a whopping 900 tons of ice, according to Live Science. And with Juuka’s current temperatures plunging below 0, Finland is probably a much smarter location than where da Vinci originally had in mind.

[h/t: Live Science]

19 Must-Visit Stops on Mexico City's Metro

About 5 million people ride the Mexico City subway every day—but most commuters don’t realize how much there is to do and see without ever having to go above ground. From piano stairs to a space tunnel, exploring the attractions hidden within the metro just might be the most fun you can have for 5 pesos (about $0.25 USD). These Mexico City metro stations settle the old question once and for all; it’s both the journey and the destination.


Talisman station (line 4) has a mammoth logo for a reason: Mammoth fossils were unearthed during construction of the metro, and you can see the bones—which date back to the Pleistocene—on display there.


space tunnel at La Raza station
Sharon Hahn Darlin, Flickr // CC BY 2.0

How do you make a long transfer fly by? Transform it into a walk-through space tunnel illuminated by a glow-in-the-dark night sky, the highlight of the science museum located within La Raza station (lines 3 and 5).


Viveros (line 3), a station named for the nearby nursery, is in full flower: It was recently given a jungle makeover complete with imitation palms, jaguars, and snakes to raise awareness for the preservation of southern Mexico’s Lacandon Rainforest.


Complement your day trip to the pyramids at Teotihuacan with a stop at the Pino Suarez station (lines 1 and 2), where you can see a 650-year-old pyramid dedicated to Ehecatl, the Aztec god of wind. Tens of thousands of users go through the station daily, making the pyramid one of the most visited archeological sites in Mexico. (Though it's referred to as Mexico’s smallest archaeological zone, the National Institute of Anthropology and History doesn't consider it a "proper" archaeological zone "due to its size and the fact of being located in a Metro Transport System facility.")


Hidalgo (lines 2 and 3) may be the most miraculous of all of Mexico City’s metro stations: In 1997, someone (possibly a street vendor) discovered a water stain in the shape of the Virgin of Guadalupe in one of its floor tiles. The apparition attracted so many pilgrims that metro authorities eventually had to remove the tile, which is now enshrined just outside one of the exits (follow the signs for Iglesia), near the intersection of Paseo de la Reforma and Zarco. And if you happen to visit this station on the morning of the 28th of any month, you’ll be swarmed with pious commuters carrying figurines of Saint Judas Thaddeus—patron saint of delinquents and lost causes—who is venerated at the nearby San Hipolito Church.


No time to visit the vast National Museum of Anthropology? You can still catch reproductions of Mesoamerican statues at the Bellas Artes (lines 2 and 8) and Tezozomoc (line 6) stops.


miniatures on the Mexico city subway
Randal Sheppard, Flickr // CC BY-SA 2.0

Miniature maniacs shouldn’t miss the scale models of Mexico City’s main plaza at the Zocalo stop (line 2). They depict, in tiny form, the metamorphosis of the capital from the Aztec Templo Mayor to the present-day Metropolitan Cathedral. (And bonus points to anyone who can spot the cat who lives in this station.)


The music-themed Division del Norte station’s (line 3) free karaoke corner draws a crowd gathered to watch fellow riders belt out boleros and ballads on their way to work. The unassuming abuelitas laden with bags from the market always have the most impressive pipes.


piano stairs at Polanco station
Victor.Aguirre-Lopez, Wikimedia Commons // CC BY-SA 3.0

Don’t take the escalators at Polanco station (line 7), because the stairs are a giant musical piano keyboard. Finally, here’s your chance to live out Tom Hanks’s piano dance scene from the movie Big.


The Guerrero stop (lines B and 3) is a tribute to the legends of lucha libre, with costume displays and murals dedicated to 45 of Mexico’s finest masked fighters.


The largest bookshop in Latin America can be found in the long passage between the Zocalo and Pino Suarez stations. The underground emporium known as Un Paseo Por Los Libros sells titles from textbooks to manga and also hosts free workshops, lectures, and movie screenings.


murals in the Mexico City subway
Thelmadatter, Wikimedia Commons // Public Domain

Any visitor to Mexico City should check out Diego Rivera’s murals—but on your way, don’t forget to look up at the murals that decorate many metro stations. Particularly impressive are Guillermo Ceniceros’s ambitious chronicles of art through the history of time on the walls at the Copilco (line 3) and Tacubaya stations (lines 1, 7, and 9). On the kitschier side, see how many famous faces you can pick out in Jorge Flores Manjarrez’s I Spy-style mural of pop stars at the Auditorio stop (line 7).


A museum of caricatures located inside the Zapata stop (line 12) is an homage to Mexican cartooning, including plenty of satirical interpretations of the mustachioed revolutionary who gives the station its name.


If Chabacano station (lines 2, 8, and 9) feels unsettlingly familiar, it might be because it was used as a shooting location for the subway chase scene in the Arnold Schwarzenegger film Total Recall. Legend has it you can still spot splashes of fake blood on the ceiling.


Museo del Metro de la Ciudad de México
ProtoplasmaKid, Wikimedia Commons // CC BY-SA 4.0

Has this metro adventure turned you into a super fan? Do a deep dive at Mixcoac station’s (line 12) sleek Metro Museum, where you can learn even more fun facts about the subway’s 50 years of history while you wait out rush hour.

Pop Chart Lab
150 Northeast Lighthouses in One Illustrated Poster
Pop Chart Lab
Pop Chart Lab

Some of the world's most beautiful and historic lighthouses can be found in the American Northeast. Now, Pop Chart Lab is releasing an illustrated poster highlighting 150 of the historic beacons dotting the region's coastline.

The 24-inch-by-36-inch print, titled "Lighthouses of the Northeast," covers U.S. lighthouses from the northern tip of Maine to the Delaware Bay. Categorized by state, the chart features a diverse array of lighthouse designs, like the dual towers at Navesink Twin Lights in New Jersey and the distinctive red-and-white stripes of the West Quoddy Head Light in Maine.

Framed poster of lighthouses.
Pop Chart Lab

Each illustration includes the lighthouse name and the year it was first lit, with the oldest lighthouses dating back to the 1700s. There's also a map in the upper-left corner showing the location of each landmark on the northeast coast.

Chart of lighthouses.
Pop Chart Lab

The poster is now available to preorder for $37, with shipping set to start March 21. After memorizing every site on the chart, you can get to work exploring many of the other unique lighthouses the rest of the world has to offer.


More from mental floss studios