An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

The courtyard of this small Marinid madrasa is a dazzling example of intricate Islamic architecture.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

The other side is actually green.

Traditional 11th-century outdoor tannery.

The United States' oldest Episcopal church still in active use.

Washington D.C.'s most famous pianist, composer, and bandleader still tickles the ivories outside Howard Theater.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

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

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

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

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

The tomb was guarded by soldiers from both sides of the war, and some left their initials carved in the brick.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

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

The resting place of a Civil War celebrity's amputated limb.

More than a century after her death, Little Gracie Watson remains one of Savannah's most often-visited residents.

Home to the world's largest quilt collection dating from the 1600s through today.

An ornate Art Deco tile mosaic representing Nebraskan life, both modern and prehistoric.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

The drama of nature in full effect in this Nevada State Park.

Preserving the remains of Native American cultures which otherwise would have been submerged behind Hoover Dam.

Legend says one of the world's largest marine geysers is actually a whale that got wedged within the rocks.

Dozens of rockets and missiles are on display outside a testing facility in the Utah desert.