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

The narrowest house in America is seven feet of pure spite.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

The final resting place of the tragic king and queen of the Jazz Age is tucked away in a small Maryland graveyard.

A relic of FDR's brief foray into utopian urban planning.

A lawn full of retired spacecraft on display at one of NASA's first research labs.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

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

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

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

Volcanic stone sentinels stand watch at a Korean Bell Garden in Virginia.

Washington's iconic carousel has a nice piece of Civil Rights history.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

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

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

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

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

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

The most decorated dog of World War I is preserved in the Smithsonian.

Perhaps the most scandalous statue of America's first president.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

The story behind the mysterious symbol painted in front of the historic university's famous Rotunda.

Outdoor exhibits explore the contributions of European, African, and indigenous peoples to American frontier culture.