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

The world's largest wooden structure.

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

Fragments of human bones are embedded in the walls of this quaint alley.

An abandoned anti-smuggling station decays along the boundary between Portugal and Spain.

The facade of this 16th-century building is decorated with carvings of 300 seashells.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

Remarkably intact Roman stone fortifications have encircled this Spanish city for centuries.

Seaside ruins of a settlement that date back to the first century B.C.

This line of 12 tower mills described in the story of Don Quixote is among the most iconic landscapes in Spain.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

An abandoned quicksilver mining town surrounded by the Big Bend parks.

A commemoration of over 150 of St. Louis's favorite sons and daughters.

The eccentric and colorful pavilions of Tower Grove park are a beloved and overlooked symbol. 

A 2017 crowdfunding campaign saved this historic castle from being destroyed.

A simple but powerful tribute to the 20 victims of the 1692 witch trials.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

Want to build a wind turbine? Secede from the nation.

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

During the 19th-century, this park was a vital trading fort.

The state bird of New Mexico, constructed entirely out of garbage.

The U.S. Air Force has an anti-satellite laser weapon.