These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

A former pillar of the Black community in Ellicott City.

The last of Fairfax County's one-room schoolhouses.

The newsstand that never closes its doors—well, almost never.

The original place where water met land in the City by the Bay is outlined in brass.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

World's largest collection of serial killer artwork and other macabre exhibits.

Thousands of crosses and markers for soldiers who lost their lives in Iraq and Afghanistan blanket a California hillside.

A graveyard that dates back over 200 years stands near a busy shopping center.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

A former major munitions plant that has been converted into a sprawling art space.

Located at the former Lorton Prison the Lucy Burns Museum tells the story of the 91 year history of the prison including the dark chapter of its involvement in the women's suffrage movement.

These unusual rooms on wheels are holdovers from the 1960s.

A 14-foot monument marks the resting place of two of the town's earliest residents—and one unknown soldier.

The largest retailer of seashells in the world.

This small museum gives visitors a chance to soak up the history of the "sponge capital of the world."

The unique collection includes bronze cast handprints of some of America's most famous astronauts.

A building so large that it has its own weather.

A double agent hid information for the Soviet Union beneath this bridge for more than 20 years.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

These WWII-era murals were initially booed as a libelous portrayal of the American dream but have survived multiple attempts to have them destroyed.