A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

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

The span is crooked and made from two older recycled bridges.

The school tested mustard gas for the U.S. Army during World War I.

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

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

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

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.