Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

Half of a waterfall goes into the river while the other half seems to disappear.

The only diamond mine in the world where you can keep what you find.

Abandoned power station once home to a squatter community, now being developed into an arts center.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

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

Dig for your own trilobites in this goldmine of invertebrates.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

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

Rare recess caves fill this unbelievably beautiful Ohio park.

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

A tiny red pebble marks what may be the quietest outdoor spot in the United States.

Legends surround this jagged rock formation in the New Mexico desert.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

Treehouse motel and treehouse-building school.

A once grand hotel is being retaken by the wilderness it once capitalized on.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

This former coal gasification plant found a curious second life as a popular public park.

Visit this playground of waterfalls, caves and sinkholes.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

A popular European tradition makes its way to the states on one of America's most famous bridges.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

A giant 400-acre preserve in North Florida for displaced wolves.