When the Austin Dam failed it destroyed much of Austin...and then it failed again.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

A train station that was abandoned by the coal industry and was later converted into a cocktail bar.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

A park full of outsider art, created by college students studying outsider art.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

Amazingly, this old machine within the Resorts Casino still functions.

A World War II-era submarine is stuck in the mud in New Jersey.

New Jersey's last historic covered bridge was rebuilt from pieces of the original 19th-century structure.

A simple plaque remembers an act of WWI terrorism that obliterated an island and forever scarred the Statue of Liberty.

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

Historic town settled in the 19th century because of its convenient location along a popular coal transport route.

A playground inspired by differential calculus dangles from the ceiling of the Liberty Science Center.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

This tiny structure was built by the creator of the Brooklyn Bridge.

Once the world's largest reinforced concrete structure, this abandoned bridge now beckons urban explorers.

Where the embers of the Big Bang were first detected.

The remains of an old sawmill, gristmill and the surrounding industry dating back to the 18th century.

A historic grist mill and active sluice on the Black River.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.