Image Source: Maartin Danial
Uluru rock. What is it? A humongous sandstone monolith smack dab in the middle of the Australian outback. It's around 600 million years old, higher than the Eiffel Tower at over 1,100 feet tall, 2.2 miles long, 1.2 miles wide, and has a circumference of 5.8 miles.
Why is it here? It's made of a harder rock than it's surroundings, so it got left behind after erosion did its thing. Like an iceberg, a large portion of this rock isn't even visible--it's underground. The orange-red color is due to the surface oxidation of iron. Without the iron, it would appear grey.
Image Source: Eddy
This site is a major tourist destination, but because it is a sacred site, climbing is discouraged (but not forbidden unless the winds are high), and visitors are asked not to take home pieces of the rock as souvenirs. But they do. Every day the park service receives at least one back with notes of apology. Apparently the rocks are cursed. Some of the returns come with notes of accidents, divorce, and other instances of bad luck. The largest rock sent back so far weighed 32 kg (70 pounds). Wonder what the postage was on that sucker?
Would you dare bring home a pebble or twig from this place?
(Information adapted from Science Kids: Uluru Facts for Kids and The Telegraph: Tourists Return Stones to "Cursed" Ayer's Rock)