
The staircase designed by Leonardo da Vinci in 1516 AD, is located in the Château de Chambord in France.
It is a double-helix structure, featuring two spirals that ascend the central tower without intersecting, allowing people to go up and down simultaneously without meeting. This innovative design exemplifies Leonardo's mastery of engineering and architectural principles.
The staircase was commissioned by King Francis I, who invited Leonardo to France in his final years. It remains one of the most remarkable examples of Renaissance architecture, showcasing Leonardo's genius and the grandeur of French royal residences.
Credit: ArchaeoHistories

The Gilligan's Island radio was actually NOT a prop.
It was a working radio...Packard Bell model AR-851 table-top AM radio...previously purchased by show creator Sherwood Schwartz to listen to Dodger games in his office. Schwartz didn't like the black radio used in the pilot...thought the white radio would show better. (He had the prop department add the handle and antenna for effect). When the show wrapped after the 3rd season, Schwartz took the now iconic TV prop back to his office, plugged it back in, and continued to listen to Dodger games on it for decades....

Fingal's Cave, located on the uninhabited island of Staffa in Scotland's Inner Hebrides, features striking hexagonal basalt columns formed from cooled volcanic lava. Measuring about 72 meters long, it boasts remarkable acoustics that create a cathedral-like ambiance. Named after the Irish hero Fingal, it has inspired many artists, including Felix Mendelssohn, who composed "Fingal's Grotto." Its beauty continues to draw tourists and explorers globally.