According to Greek mythology, this natural spring is the home of a freshwater nymph.

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

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

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

A much-maligned monument to teetotalism.

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

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

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

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

One of three remaining theatres in the United States created in the Art Deco Mayan Revival style.

Built in France in the 1400s, this gothic chapel now resides at Marquette University in Milwaukee, Wisconsin.

The Roman city was the birthplace of various emperors and is home to one of the empire's most impressive architectural feats.

Drink the 'Blood of Christ' in this Roman Catholic fever dream.

A 16th-century Andalusian palace.

This medieval city gate is now a blend of the past and the modern world.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

This curious, round temple is the oldest still-standing marble building in Rome.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Breathtaking and huge 430 year old maps of Italy.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

A place steeped in history that may be best known as the set of a 1960 film.

A factory in Milwaukee where poop is reclaimed… and recycled.

A hidden gem that highlights the life and innovations of Les Paul, the "Wizard of Waukesha."