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

The national park was once a plantation estate.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

A painfully obvious spy house sits right across the street from the Russian Embassy.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

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

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

The United States Capitol's former columns still stand.

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

Remnants of a storybook amusement park hidden behind a strip mall.

This former asylum for Black Americans is haunted by its history of violence and racism.

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

America's first nuclear-powered merchant ship is now a time warp to the atomic age.

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

The whole world in one water tank.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

This abandoned Victorian-style house was built in 1884.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

After hundreds of years of settlement, this once-bustling fishing village sunk into the Chesapeake Bay.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.