Dramatic river bend surrounds a natural red-rocked pedestal.

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

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

While it is not equipped to peer into outer space this observatory looks like it was built on the moon.

This frequently-photographed waterfall takes only a short hike to visit.

Site of the greatest known waterfall that ever existed.

100-year-old shipwreck you can walk up to at low tide.

Smooth basaltic rocks tell a tale of ancient glacial waterfalls.

Thousands of turbines whir at at the origin of North American wind power.

A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

The largest dune field in the Mojave offers a chance of hearing the 'singing sands.'

A secret fresh water spring for animals and humans alike hidden along the most famous road in the United States.

A bizarre roadside attraction and the first instance of miniature golf in the world.

More than five miles of underground passageways.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

One of few remaining antique carousels with stationary animals in the U.S.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

Over 50 whirling pools left behind from the glacial age.

An idle pastime becomes a record holder in Boys Town, Nebraska.

South Dakota's oldest operating brewery is housed inside a historic firehouse.

Every president in history is immortalized in bronze in downtown Rapid City.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.