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

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

Tucked behind New Jersey's abandoned Gingerbread Castle lie the eerie ruins of a once-flourishing paper mill.

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

Along the Palisades skyline are the ruins of a large mansion built in 1911 and demolished in the 1930s.

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

The ruins of this long-abandoned unsuccessful gold mine can still be found.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

Exact replica of the ancient monument, but much, much lighter.

Outsider art meets paleontology at this roadside reptile repository.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

The highest point in Virginia can only be reached by passing through ponies and flowers.

A small Richmond island dotted with the remnants of hundreds of years of history.

Railroad came. People came. Railroad left. Town died.

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

An eerily abandoned stone tower is all that remains of a demolished dam on Cape Fear River.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

Home to items never before seen by the public.

An Industrial Revolution-era public work that purified water using nothing but sand.

The United States Capitol's former columns still stand.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.