The loneliest island in New York.

A house carved into a rock in the 1940s.

An abandoned vacation home spent a decade taking on legends. It's now taking on water.

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

This massive redwood tree has a hole in the base big enough to drive through.

Crumbling ruins mark the site of a couple's grisly murder in the woods.

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

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

A short hike into the mountainside forest reveals a decaying 1890s town.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Abandoned bridge hidden deep in the San Gabriel Mountains.

An inconspicuous footbridge beloved by San Diego locals.

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

The remains of the first punk club in L.A.

The largest permanent Monopoly board makes one of the longest games even bigger.

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

The highest bridge in America was built for an almost unnervingly small amount of money.

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

In a city filled with Frank Gehry buildings, one stands out as one of the architect's weirder works.

The longest navigable underground river in the United States is home to countless blind and albino animals.

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