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

The Vermont grave of a 4,000-year-old mummy prince.

The home where a lovestruck Fitzgerald wrote his first published novel, "This Side of Paradise."

Location of the most powerful laser in the world, and the potential birthplace of tiny stars.

Hidden for 165 years inside a building designed by Thomas Jefferson are the remains of what may be America's first educational chemistry lab.

A small, peaceful sculpture garden with a grim memorial to a disaster that took place a few blocks away.

Former laboratory of radical psychiatrist Wilhelm Reich.

The unusual burial monument of Arizona's first governor.

The site where a nuclear bomb was lowered over 8,000 feet underground and detonated as an experiment in natural gas extraction.

If all members were present at the table, a sixth of the world's wealth would be under the same roof.

The gilded vestiges of a sterling department store can still be found in a Brooklyn shopping center.

A tiny survivor of the Donner Party disaster.

Former self-sufficient mental institution now a planned community.

One of the oldest anatomical theaters in the U.S. still in use was once the site of an infamous cadaver riot.

The ruins of a 19th century shelter run by the Independent Order of Odd Fellows.

Location of a reliquary containing bone fragments of 18 saints.

These etchings reveal the history of a long-gone quarantine site.

The unique collection includes bronze cast handprints of some of America's most famous astronauts.

Tucked away atop a quaint Alabama pharmacy is this tiny display of antique medical tools.

Once considered the height of medical modernity, this structure is now the oldest remaining component of Roosevelt Hospital.

From overly ambitious (and eventually abandoned) atomic dream to bustling office park.

A military museum and library dedicated to the citizen soldier.

Dilapidated Mayan-themed ballroom was one of Detroit's most popular venues through the 40s.

Home to a vast and influential collection of Shakespeareana.