An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

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.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

This fertility idol of questionable authenticity inspired an iconic Indiana Jones artifact.

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

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

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

A brass and marble scale model of the solar system embedded in the concrete.

This bridge over D.C.'s Rock Creek Park is sometimes called the "Buffalo Bridge" because of its four buffalo sculptures, which were cast from a single piece of bronze.

Also known as the Founding Church of Scientology.

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

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

It was once the base for a series of domestic terror attacks.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

The "lovely red Vega" of the legendary record-settling pilot.

A street in front of NASA's D.C. headquarters has been named in honor of the Black women who were essential to early spaceflight.

The oldest continuously operating fish market in the United States.

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

California's longest-running tourist attraction is a stump.

A popular tourist cave with a dark past.

One of the oldest reform schools in the United States, home to wayward boys such as Merle Haggard, now abandoned.

A giant chess set, minus the psychedelic drug trip.

Considered by many to be one of the most dangerous highways in Alaska.