This religious museum resides in a church crypt next to the founder's house.

Dozens of houses in the Adirondack Mountains are reminders of a literal "cottage industry" to cure people of a deadly disease.

It wouldn't be long after purchasing this farm, Brown would lead his siege on Harper's Ferry.

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

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

A line of blue paint marks the route of the inaugural parade.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

There’s a hidden military meme engraved on the World War II Memorial.

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

Home to items never before seen by the public.

The tragic reality of a village riddled with rumors of haunts, chemical spills, and serial killers.

This campus museum commemorates a national tragedy.

Inside houses a vast collection of military aircraft and missiles spanning the ages.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

Memorials and tributes scattered across the university grounds remember a famous national tragedy of the Nixon era.

This steamer is known as "The ship that built Cleveland."

A single handprint, which, according to Ohio State University legend, cannot be scrubbed off.

It took more than 20 years and a sharp eye for one man to assemble this quirky collection.

Ohio's 19th-century communist micro-society.

Marvel at this turn-of-the-century masterpiece that has been turned into a rather stately supermarket.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.