The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

The celebrated eyesore created by starry-eyed sweethearts.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

Famously misunderstood wonder of the ancient world

Northern Ireland's Brobdingnagian stepping stones.

The first declared National Monument in the United States.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A beautiful geyser under environmental threat.

The largest source of fossilized insects anywhere.

Hidden beyond a kitschy giant beetle is this remarkably sprawling collection of preserved insects.

This elaborate towering structure was once famed for its revolutionary height.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

This burial pyramid in central Ireland is thousands of miles and thousands of years away from its Egyptian inspiration.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.