This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

The early data processor factory founded in Washington for the 1890 U.S. Census went on to become IBM.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

This church built atop a gas station promises to "equip you for the next stage in your life’s journey."

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

An overlooked tribute to one of the most important peace deals in American history.

A massive, majestic mammal watches over pedestrians from his perch atop a former B.P.O.E. lodge.

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

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

This neighborhood grocery houses a treasure trove of Eastern European delights.

An aptly-named street near the birthplace of the modern LGBT rights movement.

Sniff the Titan Arum's rotting flesh.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

The only quarter of the Old City not dedicated to a major world religion.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

Museum preserving torture methods from the past.

A safari-themed castle in the South African bush with the largest maze in the southern hemisphere.

This African beach is home to thousands of rare mainland penguins that are known for their annoying voice.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.