Scenic mount trashmore, Virginia Beach's most curious waterfront still has a couple of secrets.

Instead of becoming a power plant, this abandoned complex became a massive letdown.

An abandoned munitions factory with a shot tower continues to wage war on the surrounding environment.

Once the largest public hospital for the mentally ill was also surrounded by controversy.

Hundreds of numbered stakes hidden in the woods mark the graves of the lost souls of a nearby asylum.

This delicate museum is devoted to the art and industry that once supported Cape Cod's oldest town.

This abandoned ironworks was once the most important military supplier in America.

This dilapidated castle-like structure overlooks the Hudson River at one of its widest points and was once home to nuns.

The remains of one of the last mining camps developed on the New River.

The only remaining historic maritime signal station in the United States.

Once America's tallest structure, now a Baltimore landmark.

A beautiful, water-filled quarry that has become a popular haunt for swimmers and artists.

This tower pays homage to a legendary Viking fort established in Massachusetts that never really existed.

The dairy farm in upstate New York where nearly half a million people gathered for three days of peace and music in 1969.

A sewing machine tycoon built this miniature castle for the people and to beautify a lakeshore.

This abandoned neighborhood is now a park filled with beautiful trees, wildflowers, and hints of its past.

Steam engines and conveyor belts are remnants of a genius system left in the middle of the Maine woods.

This dam in the woods, built by Henry Ford with only manpower and oxen, holds no water and serves no purpose.

A defunct all-girls college which may be the resting place of H.P. Lovecraft's real-life Necronomicon.

This stone gatehouse was once the entrance to a historic mountain resort, and it had a cameo in a cheesy cult horror movie.

Rows of 19th-century brick ovens used to process coal into coke form the center of a wooded park.

An abandoned subway tunnel that could have reinvigorated Staten Island still lies somewhere beneath this Brooklyn park.

This beautiful stone arch bridge wasn't even expected to stand for one day, but people have been crossing it for centuries.

At the supposed instruction of Ben Franklin and Socrates, a Spiritualist believer intended to birth a mechanical messiah here.