A much-maligned monument to teetotalism.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

Washington's iconic carousel has a nice piece of Civil Rights history.

Sit where JFK proposed to Jackie or where Nixon dined on meatloaf at this storied pub.

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

A haunting tribute to pioneering photographer Clover Adams.

This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

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

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

This cannon dating to 1755 has stood guard at this suburban intersection since 1915.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

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

The only arched bridge made of stone on the entire Mississippi River.

This mysterious petroglyph evokes the ancient swastika symbol but was later vandalized with the more troublesome Nazi one.

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

You might know it as the Overlook Hotel, but the inside is not going to be familiar.

The pit stop from "The Texas Chainsaw Massacre" now serves beef and pork barbecue, not people.

The historic “pink house on the hill” is an architectural gem that now serves as a center for water conservation.