The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

Daily lunch spot for many of Washington, D.C.'s cab drivers.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

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

The most accurate timepiece in the world.

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

A derelict bit of transportation infrastructure hidden in the woods.

A historic cemetery with unique artwork, a Civil War fort, and also happens to be the site of the Battle of Bladensburg.

Politicians, bureaucrats, and military officers gathered in this field near the Capitol to settle their disputes with blood.

A state park that once served as an important river crossing, and now offers protected lands for endangered plants and animals.

This fertility idol of questionable authenticity inspired an iconic Indiana Jones artifact.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

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

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

Rumor has it the hot dog stand was targeted by two Russian nuclear missiles.

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

A former major munitions plant that has been converted into a sprawling art space.

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

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

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

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