Visit the monolithic tomb of America's most famous general.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

An overlooked memorial honoring the local Washington residents who died in World War I.

A historic freight system that found the true gold rush is in tourism.

One of Hollywood’s favorite government buildings.

While many places make the claim, the Library of Congress says this restaurant is the birthplace of the hamburger.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

The world's largest wooden structure.

A 16th-century Andalusian palace.

The final resting place of the great navigator, or maybe his brother.

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

Eat the ultimate iteration of Portugal's most beloved pastry.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

Sip cherry liqueur at a bar dating back to 1840.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

The dramatic upward-curving roof is one of the most iconic examples of Googie architecture that still stands today.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.