Elevated freight railway turned wildly successful urban park.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

A unique sculpture park that specializes in the huge and bizarre.

One of New Jersey's oldest surviving buildings still bears the mark of our former British overlords.

A bronze monument to the infamous radio broadcast in the real New Jersey town where the fictional Martians crash-landed.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

Local lore claims this park is named after a young woman who jumped off a cliff.

In which a local geological marvel becomes a quaint roadside attraction.

An indoor miniature village and labor of love for Laurence Geiringer, a model railroad enthusiast.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

A toxic ghost town sitting atop a massive coal fire.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

"Where the ducks walk on fish."

Frank Lloyd Wright’s most iconic home dangles over a Pennsylvania waterfall.

Outsider art meets paleontology at this roadside reptile repository.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

Tracks near this Texas nature site were once thought to support the Creationist belief that man and dino coexisted.

Belly up to the bar in Cowtown, don't forget to buy some boots.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Scattered throughout London are ancient remnants of the city's former bounding wall.

In this case, 'zero' marks the spot where the iconic Old Spanish Trail ends.