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The Marble Caves of a Patagonian Lake 
Cathedral-like caverns carved into marble found in a Chilean lake create an otherworldly spectacle, only accessible by boat. The BBC explores this natural wonder: https://www.bbc.com/reel/video/p06xgkdk/a-marble-world-submerged-in-a-lake

Colorful Maps Reveal River Basin Complexity 
Cartographer Robert Szucs has produced a series of maps depicting the world’s watersheds in vivid colors. The maps expose the number and complexity of river basins covering the planet. The Smithsonian has the story: https://www.smithsonianmag.com/arts-culture/these-beautiful-maps-capture-rivers-that-pulse-through-our-world-180971789/

A Glorious Bird Song Opera 
An unusual treat, both auditory and visual, awaits the venturesome, here: https://vimeo.com/243312820
[Thanks to Stephanie Hazen for the link.]