After emancipation, former slaves paved the roads of their newly built settlement with these bricks.

A 400-year-old live oak tree with a fictitiously morbid past.

A computer bug so primitive it was an actual insect.

Largest Roman Catholic church in North America.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

Home to a vast and influential collection of Shakespeareana.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

The oldest continuously operating fish market in the United States.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

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

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

The iconic statue was moved to a new spot overlooking the James river after several years as a mascot for the local baseball team.

Victims of the Webster Massacre are buried here in a mass grave.

A 12-foot sculpture serves as a constant reminder of the importance of protecting and restoring the Boardman River.   

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

Two Civil War-era cemeteries stuck between runways at the world's busiest airport.

Two flush headstones mark the only known graves to be embedded in an airport runway.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

Travel through the wholesome amusements of yesteryear at this charming miniature village.

A prehistoric rock shelter that's literally in someone's backyard.

In the middle of a suburban Denver neighborhood is a cave that once provided solace for a prominent Ute chief and his family.

This Chinese-style quartz sundial was saved in its final hour.