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.

A mining town, now abandoned, was built in a canyon so narrow that the railroad ran right through the hotel lobby.

A vortex fountain that seems to rise out of the ground.

Deep underground, the rusting remains of a German water pumping station from World War II.

These waterfalls can be twins or triplets, depending on how much it's rained recently.

The seventh largest spring in the world.

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

A dark, narrow tunnel that leads to a charming lake and waterfall.

Over fifty whirling pools left by the glacial age.

This “living museum” at UCLA exhibits thousands of plant species from all over the world.

Nestled between a college and a golf course, the garden is home to more than 2,500 rhododendrons.

Under the shadow of its towering parent tree, a rare specimen of sequoia produces ghostly white leaves.

At an estimated 3,800 years old, this olive tree is one of the oldest on earth.

An oasis of lilies cultivated by the "Indiana Jones of Water Lilies."

Every summer, the Mendenhall River greenbelt comes alive with an explosion of magenta flowers.

In Costa Rica's cloud forest, the roots of a woody ficus create a botanical bridge.

An underground wonderland in Iowa.

The damming of the Colorado River buried an iconic geologic formation before record-breaking drought brought it back.

The cliff and rock formations are made out of Sioux Quartzite.

A natural rock bridge towers above the sea.

A 40-foot waterfall flows into this unique natural swimming hole.

At the most northwestern point of the contiguous United States lies a trail leading through an ancient forest to stunning cliff-side vistas and massive oceanside caves.

You can find America's highest suspension footbridge at Grandfather Mountain in North Carolina.

A 315-foot spire jutting out from the Blue Ridge Mountains makes for breathtaking views.