Hidden high on a remote mountain peak is a humbling and mysterious Vietnam War memorial.

There just so happens to be a court even higher than the U.S Supreme Court: a basketball court in the building itself.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

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

A diminutive plaque recalls the treetop sniper who almost killed Abe Lincoln.

FDR's Art Deco hospital tower was hopelessly inefficient.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

The headquarters of the Audubon Naturalist Society is a small slice of heaven for nature lovers.

An astounding collection of medical specimens, including bits of President Lincoln.

Brain collection and database that narrows the gap between man and animal.