This mile-wide crater high in the mountains of Indonesia is the largest gold mine in the world.

Incredible rock formations jut from the southern end of this spectacular stingray-viewing spot.

One of the few places in the world home to living stromatolites.

Alien rock formations grown from the sands of an Australian national park.

This pair of Australian "waterfalls" appear to be falling straight across the land.

This gracefully curving formation looks like a massive wave that was suddenly turned to stone.

These Australian rock formations look like Martian beehives that have grown up out of the landscape.

The gigantic preserved heart of a champion racehorse.

A little-known museum of Ancient Roman and Ancient Greek artifacts.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

A sparkling sandstone cliffside that's worth a visit while it still exists.

Though considered an eyesore by some, this boxy Brutalist high-rise plays a significant role in Sydney's past.

An ancient engraving by the Cammeraygal people was uncovered in the transformation of a North Sydney industrial site.

These giant grain silo portraits capture elements of rural life in Australia.

An ancient rock engraving shows Aboriginals used their advanced knowledge of the stars to hunt and gather.

These glyphs have long been attributed to ancient Egyptians, or maybe they're just a hoax.

White cockroaches and other cave species occupy this massive series of lava tubes.

A wonder of natural limestone formations etched by millions of years of natural interaction between rainfall and rock and air.

A huge stone pyramid built for fun.

The statue honors an adventurous seafaring cat.

Australian museum dedicated to human health and lack thereof.

The gigantic skull of a long-extinct species that once roamed the forests of England and Ireland.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

Pop culture has helped to keep this iconic British building from being destroyed.