Two massive rock outcroppings on the Oregon coastline.

The trunks of 3,000 year-old trees lurk beneath the surface of this crystal clear lake in Oregon.

This natural marble cave is one of only five national monuments in Oregon.

Despite a legend that says this highest peak in Oregon was climbed in high heels scores of people have died on its slopes.

The first North American landing spot for James Cook on his third voyage of discovery in the Pacific.

Formerly secret, precariously perched boulders.

The longest continuous lava tube in Oregon.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

This Oregon farm is dedicated to teaching people the professional art of tree climbing.

See Hoover Dam and the bypass bridge from a perspective usually off-limits to the public, and float the upper part of the Black Canyon National Water Trail.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

On the Oregon coast there is a natural hole that seems to be draining the sea.

Bad farming practices caused this unnatural natural wonder.

This quiet park's strange sedimentary spires were named after Kodak's color film.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

Even Henry David Thoreau found this glacial pothole irresistible.

Meet manatees face-to-face at this zoo for native species.

A raised boardwalk winds through a thicket of stunted, century-old trees no more than nine feet tall.

Over 100 million years ago, beach-bound dinosaurs left permanent marks on San Antonio's landscape.

This beautiful ancient site is dotted with perforated sandstone pillars considered sacred by some Native American groups.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

Surprisingly aquamarine waters fill deep lakes formed at the end of the last ice age.