A showcase of engineering might that was also symbolic of westward expansion.

A cemetery dedicated to the mountaineers who perished climbing Mount Aconcagua.

California's first suspension bridge.

Constructed on the ruins of a convent, this tower saved countless lives.

A breathtaking 19th-century trail overlooks Lake Tahoe.

This roadside memorial pays homage to Argentina's Outlaw Saint.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

Once the largest town in eastern Yuba County now sits abandoned.

Many generations of travelers have passed through the steep, smooth walls of this canyon.

Art Deco stylings conceal the true nature of this bridge.

The stone marker that Mason and Dixon placed at the eastern end of the famous north-south border they surveyed.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

This tiny cluster of abandoned buildings looks like the future of the ghost town - today!

The self-made house sculpture of an outsider artist who named himself "Chief Rolling Thunder."

Concrete strongholds stand guard over the Golden Gate.

Civil War soldiers, captains of industry, and paupers all interred on historic grounds.

A historic Civil War estate-turned-museum looks back on the Confederate States of America.

Giant novelty guitars now mark the spot where Robert Johnson is said to have sold his soul to the devil.

Elvis's own personal tropical hideaway.

The timepiece that exonerated a labor radical accused of a parade bombing that killed ten people.

A dentist's hated concrete colossi are now beloved icons of the community.

A sculpture dedicated to Napa Valley's oldest mineral water company.

A trash dump made beautiful by nature's power.

Monumental sculptures of Patrick Amiot, constructed from debris, detritus, and determination.