A century-old miner's quarters turned mansion.

The former home of the 11th president of the United States.

Founded in 1788, this Rhode Island institution is the oldest operating general store in America.

This lab's maddening silence is good for business but bad for sanity.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

This huge abandoned fortress hidden inside a mountain holds a world of subterranean secrets.

The caldera of this mini-volcano has been turned into a naturally heated mud bath.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

This fortress in Honduras was built to resist pirates, but its builders had more to fear from the British.

This Gothic church houses ornate royal tombs and a magnificent gilded altarpiece.

A magnificent place to see authentic paleolithic cave paintings that are an astounding 33,000 years old.

This religious complex carved into a cliff is steeped in legends of miraculous stags and the Holy Grail.

Village situated on a narrow volcanic escarpment.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

A hand-built folk art installation covered with messages of God's love.

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

The remains of a historic ranch house that witnessed the Civil War battle dubbed the “Gettysburg of the West.”

Rippling sand dunes frozen in the Arizona rock.

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

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

This sinkhole in the Arizona desert is filled with carbonated, arsenic-rich water

A once popular resort—said to be the vacation spot of gangster Al Capone—now remains abandoned in the woods of Arizona.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

Built in 1785, this residence is the oldest stone house in Georgia.