A hidden "place of interment for gentlemen."

A crumbling hospital from the 1850s on Roosevelt Island.

Townhouse facade doubles as an RMS Titanic Memorial.

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

The trials and tribulations of marking Poe's grave.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

This grave marks the passing of a historic Jane Doe whose identity remains a mystery to this day.

Largest Roman Catholic church in North America.

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

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

The United States Capitol's former columns still stand.