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

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

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

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

The United States Capitol's former columns still stand.

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

Eighteen miniature death-scene dioramas.

These unusual rooms on wheels are holdovers from the 1960s.

This sprawling farm was once a Cold War-era hideaway for the nation's top diplomats.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

The romance of early commercial flight still fills this Art Deco destination.

This war hero's old shop remembers the fine line between medicine and quackery during the Revolutionary War.

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

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The only intersection in America where the buildings on all four corners were built pre-Revolutionary War.

This abandoned ironworks was once the most important military supplier in America.

This rare polygonal meeting house is rumored to be built in a circle so that the devil has nowhere to hide.

This 38-drawer structure claims the superlative title, but it isn't the world's only giant filing cabinet.

The sweetest graveyard in the world is filled with headstones for dearly de-pinted ice cream flavors.

A bygone village occupation lives on via this quaint public chalkboard.