This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

Home to a vast and influential collection of Shakespeareana.

There's a crumbling old mansion inside the Smithsonian National Zoo.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

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

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

People escaping slavery may have hidden inside a corpse vault.

This grand gothic brewery has been pumping out suds for over a hundred years.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

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

Home to items never before seen by the public.

Politicians, bureaucrats, and military officers gathered in this field near the Capitol to settle their disputes with blood.

These lush botanical gardens employ the most purrfect pest control force.

This plot of old-growth forest is the largest surviving remnant of New York City's original woodland.

An Escher-inspired library dedicated to the wonders of the human mind, yet closed to the public.

Final resting place of a New Haven urban legend.

The house and graveyard used in the Stephen King spine-chiller.

A monument marks the beginning of the longest north-south road in the United States.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

An underwater city for the dead.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.