Stand at the point where the two mightiest rivers in the United States converge.

From a canyon-like gorge, more than 20 million gallons of water emerge every day, while a smaller spring drips down, creating the illusion of an endless, gentle waterfall.

An underground river pushes more than 200 million gallons out of this Missouri spring every day.

An average of 33 million gallons of water pour out of the collapsed cave at the heart of this spherical spring.

Often referred to as the largest spring in America.

These pink granite water slides are the result of millions of years of erosion.

One of few surviving standpipe water towers in the U.S.

One of America's first planned communities is preserved in a state park.

Erosion and time have created a naturally-formed water park.

This art deco masterpiece was once a miracle spring mecca but is now simply a government office building.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

A floating museum that was sunk by a flood and left to rot in the tides.

Curious cave that stays a cool 56 degrees all year long.