Mysterious rocks that ring musically when struck.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

This curiosity shop contains a museum filled with bizarre, unique objects.

This tucked-away cemetery is the final resting place of a prospector who uncovered one of the largest gold mines in Arizona.

A strenuous, unofficial trail leads to spectacular views in one of America's most remote national monuments.

This 1930s log cabin began as a taxidermy museum but is now a popular country music venue.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

Petroglyphs, bird watching, and a 100-year-old Ranch in one location.

Some 10,000 works of ancient rock art cover these volcanic basalt outcrops near the Gila River.

The first steel dam in the world and the only one still functional in the United States.

Visitors to this public park will also find the ruins of an old western fort.

One man handcrafts "the best sake made outside of Japan" in a tiny desert town on Route 66.

The final resting place of the businessman-turned-astronomer who helped discover Pluto stands near his observatory.

The stone circle honors the 19 firemen who perished during the Yarnell Hill Fire.

Arizona's first government hub is a rustic cabin now preserved as part of a historical museum.

This quiet chapel was central to a community of settlers who reclaimed an abandoned fort.

The Jewish section of the famous Boothill Graveyard was abandoned for nearly 100 years.

One of the largest open-pit copper mining operations in the entire country.

A stone pillar marking the location of the westernmost battle of the American Civil War only honors one side of the conflict.

Make a wish at what might be America's only Catholic shrine to a sinner.

An amazing collection of model trains, collectibles, and artifacts that span the last 100 years.

This huge dam across the Colorado River caused an armed standoff between two U.S. states.

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