One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

One of the largest underground systems runs under Canada's largest urban center.

This impressive working clock made of 16,000 plants changes its flowers twice a year.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

Towering basalt columns, a creation of fire and ice.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

The first life claimed by this record-breaking peak wasn't lost to exposure or a fall but rather lightning.

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

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

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

The drama of nature in full effect in this Nevada State Park.

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.

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

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."

Dramatic river bend surrounds a natural red-rocked pedestal.

Most-visited and most-photographed slot canyon in the American Southwest.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.

Don't blink or you'll miss it.

The only thing stranger than stumbling onto these philosophical musings is the story of the homesteader who created them.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.