Once home to the largest photo service in the United States.

Beneath unsuspecting visitors feet, a capsule containing pieces of America’s civil rights history.

The National Park Service’s best-kept secret with views that rival any in D.C.

The local community brought back this land to transform it into a nature preserve.

This historic boathouse was constructed using salvaged lumber from burned barns.

Look closely and you’ll notice that the color changes a third of the way up the tower.

It took more than 20 years and a sharp eye for one man to assemble this quirky collection.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

This "castle" is actually a limestone and quartz formation hidden along a trail.

Situated in a bustling intersection, this "mobile" monument that honors local veterans from five different wars has moved several times but appears to have found its final resting place.

The system of air guns are fired off remotely to scare any trespassing avians.

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

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.

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

This unique historical monument features large concrete spheres designed to resemble fallen stars.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

This bridge over D.C.'s Rock Creek Park is sometimes called the "Buffalo Bridge" because of its four buffalo sculptures, which were cast from a single piece of bronze.

A gift from Japan, 17th-century lantern stands among the cherry trees at D.C.'s Tidal Basin.

The hippo that stands on this university campus was once a drunken flea market purchase.