A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

This ancient village provides insight into the complexity of the pre-Columbian Fremont Culture.

Where unreadable addresses are read, 24 hours a day, seven days a week.

A whimsical, punny collection of "fence art" outside the tiny mountain town of Baker, Nevada.

These huge stone ovens in the desert fueled the Nevada silver boom, and may have also been a hideout for outlaws.

This former mining railroad is one of the best-preserved short lines in North America.

Welcome to a feel-good American drugstore, in the classic sense of the term.

A museum in rural Utah documents the history of the Japanese Americans who were forcibly relocated there.

A shady solar power system that couldn't hold up to the harsh desert conditions.

Built in 1859, this eagle-topped archway marks the entrance to Brigham Young’s property.

One of the largest pieces of scientific equipment ever carried on a NASA space shuttle sits in a Chicago alley.

One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

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

The only Leonardo Da Vinci painting in the Western Hemisphere.

Ruins from the Parthenon and petrified wood line the interior of one of the world's most famous monuments.

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

National Mall monument to the inventor of the screw propeller.

Engraved in stone here are the signatures of everyone who signed the Declaration of Independence.

The largest library in Latin America owes its existence to an Old World earthquake and a Napoleonic invasion.

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

A 125-meter long "tribute to the Brazilian people."

This stunning Brazilian library contains the largest collection of Portuguese texts outside of Portugal itself.

Beautiful public park off the beaten path and away from tourists.

The Estatua de la Libertad stands discretely on an obscure tangent path in Barrancas de Belgrano.