A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The unusual patterns in this rock formation result from two distinct modes of weathering.

A tunnel with windows, so you don't miss out on the impressive views.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

Inside houses a vast collection of military aircraft and missiles spanning the ages.

This former Indiana quarry has been transformed into a park and SCUBA site where divers can explore the drowned mining equipment.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

Odd outsider art installations surround a Gold Rush-era ghost town.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

A chilling disappearance (and rescue) of a child uncovers a geological mystery.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Ten 25-foot-tall, beehive-shaped kilns, abandoned in Death Valley.

Inspiring Herman Melville and Henry David Thoreau, Mount Greylock in western Massachusetts is the highest point in the state at 3,491 feet above sea level.

Vermont's hills are alive with the sound of music at this historic hotel.

The highest peak in the state of Vermont has some interesting features.

Ruined pieces of stone and a swimming pool are all that remain of an amusement park swept away by a flood.

One of the world’s largest living advertisements is made out of pine trees.

This rock formation above the Wabash River is part of an ancient coral reef.

More than 100 years after his death, the world's largest steer is still attracting crowds.

An opulent testament to the boom-and-bust history of industry in north central Indiana.

Low-frequency noise compared to an idling train can only be heard by some of this industrial town's residents.

Along this stretch of Indiana roadway resides a giant insect composed entirely of scrap metal.

This relic of transportation history still stands in this Indiana city.