This unimaginably large pile of sand near Nazca is one of the tallest dunes in the world.

A museum dedicated to the German scientist who revealed the significance of the mysterious Peruvian Nazca Lines.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

A collection of unique outdoor sculptures surounded by the beauty of nature.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This modest marker near Notre Dame identifies the very center of Paris.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The Hudson River School comes alive at this palatial estate.

The oldest continuously inhabited street in America.

"A hideous albatross in the Hudson River Valley."

The only intersection in America where the buildings on all four corners were built pre-Revolutionary War.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

The seat of Buffalo government is a gorgeous Art Deco palace.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

Frank Lloyd Wright’s most iconic home dangles over a Pennsylvania waterfall.

Mysterious 500-year-old tapestries depict a unicorn hunt.

Elevated freight railway turned wildly successful urban park.

The prototype for all Nazi concentration camps.