Go take a picture with the inventor of the daguerreotype photographic process.

A historic arena where the Beatles played their first concert in the U.S.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

A historic neighborhood church is reborn as a psychedelic arts collective.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

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

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

Fittingly, America's museum of architecture is itself a magnificently designed old building.

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

A haunting tribute to pioneering photographer Clover Adams.

The most decorated dog of World War I is preserved in the Smithsonian.

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

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

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

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

A young botanist's horticultural vision realized through a lifetime of planting, tending, and collecting seeds.

Sweet or salty, super hot or mixed into beer, this is the holy land for all things licorice.

This former coal gasification plant found a curious second life as a popular public park.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

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

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.