This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

This once luxurious Catskills resort is now a haunting ruin.

When this test site was abandoned, they didn't even bother to take the rocket with them.

This airfield is home to a number of retired vintage planes in various states of disrepair.

The NBA player's elaborate former home is now a ghost of its old glory.

A 19th century hat factory still stands as a crumbling ruin in upstate New York.

The crumbling structure is a rare surviving relic of the area's bygone mining industry.

The graffitied ruins stand hidden within the Pennsylvania woods.

Every autumn, this hillside is ablaze with red summer cypress.

Centuries-old bridges grown from tangled roots.

How this Pine Barrens hill got its name is uncertain, but on a good day the view from the fire tower is crystal clear.

Several times a year, during low tide, two pairs of historic train tracks are revealed on this New Jersey beach.

Once in a state of dilapidation, this candy-inspired fortress is now being revived.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

The remains of the iconic train crash from the movie The Fugitive can still be found rusting along the Great Smoky Railroad.

They call this long foot bridge a swinging bridge, but really it's the bouncing you have to watch out for.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

Hundreds of trees made from glass bottles make up this forest on Route 66.

This frequently-photographed waterfall takes only a short hike to visit.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Finale of "William Tell Overture" can be heard as drivers pass over grooves in the road.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

A Hawaiian stairway to heaven—that you can't climb.

An abandoned stretch of highway, deteriorating next to the operational one.