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Everything filed under geology.
Fact-based Odd Places
Grand Prismatic Spring is deep blue in the middle and ringed with green, yellow and orange, and the two halves of that rainbow are made in completely different ways.
Fact-based Odd Places
In western Madagascar, limestone stands in thousands of needles up to 100 metres tall, and much of the carving was done from underneath, by caves that later lost their roofs.
Fact-based Odd Places
On Brazil's north coast the rain turns a huge field of white sand into a patchwork of freshwater pools every year, and by December most of them have vanished again.
Fact-based Weird Facts
Everest wins only if you measure from sea level: a Hawaiian volcano is taller from foot to top, and a peak in Ecuador stands farther from the centre of the Earth.
Fact-based Odd Places
On a shore in Northern Ireland, thousands of neat six-sided stone columns step down into the sea, and the real builder was a lake of lava that cooled very, very slowly.
Fact-based Odd Places
From space, a bull's-eye about 40 kilometres wide stares up out of the desert in Mauritania, and the way it formed is slower and stranger than any falling rock from the sky.
Fact-based Odd Places
On a quiet stretch of the Otago coast, dozens of almost perfectly round boulders sit on the sand like marbles left by giants, and each one took millions of years to grow.
Fact-based Cosmic Questions
The rivers pouring into the sea taste fresh, yet the ocean is salty, and the answer is a very slow partnership between rain, rock and sunshine.
Fact-based Odd Places
In the far north-west of China, a range of hills is banded red, orange, yellow and green, as if someone had painted it with a very large brush, and the paint turns out to be rock.
Fact-based Odd Places
Hot springs at Pamukkale have spent thousands of years laying a thin white skin of stone down a 200-metre cliff, building a staircase of shallow pools the colour of the sky.