[MUSIC] JOAN CARTAN-HANSEN, HOST: Sure, you know about Yellowstone National Park's famous geysers, but there are two other bizarre places in the park you should know about.

The first is Isa Lake.

It's the only lake on earth that drains naturally backwards to two different oceans.

That's because the lake sits on both sides of the Continental Divide.

The Continental Divide is the crest of the continent.

Precipitation that falls on the west side of the divide flows toward the Pacific Ocean.

Precipitation that falls on the east side of the divide flows toward the Atlantic Ocean.

But Isa Lake defies that law of nature.

Thanks to the unusual way Yellowstone's land is shaped, the west end of Isa Lake flows toward the Atlantic and the east side flows toward the Pacific.

The second is Yellowstone's Old Faithful Inn.

The architect wanted builders to use "freaks of the forest" for structural beams.

These freaks are naturally occurring twisted logs.

The Inn was built without power tools and is the world's largest log hotel.

For more information about Yellowstone, check out the Science Trek website.

You’ll find it at Sciencetrek.or