Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

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

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

The national park was once a plantation estate.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

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

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

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

Home to items never before seen by the public.

Annual Easter display made up of thousands of hand-painted eggs.

A massive cave complex boasts some of the clearest water (and most charming bats) in the world.

A tiny but mighty little pumper sits in the middle of the street, waiting for the next big oil strike.

An oil baron's wild paradise and the winner of an ill-fated air race.

Comprised of thousands of cave temple carvings this cornucopia of ancient Chinese stone art is unrivaled anywhere in the world.

The embalmed remains of the communist leader lie within a custom crystal coffin.

This ancient Chinese observatory still contains early astronomy technology.

Ming Dynasty necropolis raided during the Cultural Revolution.

The most famous location in China was home to whole dynasties worth of imperial rulers.

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

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

A suburban museum tells the story of a historic transportation network and even provides rides in antique trolley cars.