An acoustic anomaly with a mysterious cause.

Indents in the pavement are all that remain from a grisly death machine in Paris.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The remains of the iconic train crash from the movie The Fugitive can still be found rusting along the Great Smoky Railroad.

It's home to the taxidermy remains of Peter, the dog who helped convict a murderer.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

Thanks to a spelling mistake this bizarre beaver-tiger hybrid became the symbol of a Siberian town.

Experience a charming 1930's version of "infotainment."

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The entire length of the border is marked by a 20-foot-wide slash through the trees.

These ominous lava formations were said to be an entrance to the netherworld so of course they inspired a famous metal band.

This elegant arc of a waterfall marks a religious turning point.