Home to items never before seen by the public.

The site of the climactic scene from the classic horror film is now a historic landmark.

Art deco landmark on the outskirts of Washington, D.C.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

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

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

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

This poor little statue is the most vandalized memorial in Washington.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.