The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

A super-sized promotional trick that is now a D.C. landmark.

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

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

A historic arena where the Beatles played their first concert in the U.S.

A much-maligned monument to teetotalism.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

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

This grand gothic brewery has been pumping out suds for over a hundred years.

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

At 207 feet, one of the world's longest continuous escalators.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

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

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

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

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

This Maryland farm is known for its amazing corn mazes and its 30-foot junkbots.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

The land is home to swimming ponies and a legendary 18th-century treasure.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

What began as an art installation is now the private drinkhaüs for a brewery's employees.

A priceless collection of the Nation's cryptologic history.