In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

Intertwined, interspecies trees which locals believe can grant boons to lovers.

A bigger-than-life pun that has become a beacon of altruism.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

A table rock formation that has been intriguing West Virginians for years.

The highest dunes in California are the most likely place in the area to hear the Singing Sands.

The first declared National Monument in the United States.

This boulder stays on its mountain thanks to a huge chain and on the map due to local legend.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

Named after a bandit and the star of several Hollywood prehistoric landscapes, these sandstone formations are a historical part of the Los Angeles natural landscape.

An extraordinary mixture of natural beauty and man-made phenomena.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

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.

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

Gorgeous cave resemble a winter wonderland.

A tribute to one granddaughter's old apartment which now represents the whims of each visitor.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

Sandstone rock formations that look like they belong on the cover of a progressive rock album.

Recovered from the brink of extinction, at home in the Financial District.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

One of the Eight Wonders of Kansas and the first official National Natural Monument these stark formations look like nature's Stonehenge.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.